1511200617481 has 3 divisors (see below), whose sum is σ = 1511201846791. Its totient is φ = 1511199388172.

The previous prime is 1511200617463. The next prime is 1511200617523. The reversal of 1511200617481 is 1847160021151.

The square root of 1511200617481 is 1229309.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1315358965881 + 195841651600 = 1146891^2 + 442540^2 .

It is not a de Polignac number, because 1511200617481 - 2¹⁵ = 1511200584713 is a prime.

It is a super-2 number, since 2×1511200617481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1511200617481.

It is not an unprimeable number, because it can be changed into a prime (1511200617401) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 614655 + ... + 1843963.

Almost surely, 2^{1511200617481} is an apocalyptic number.

1511200617481 is the 1229309-th square number.

1511200617481 is the 614655-th centered octagonal number.

It is an amenable number.

1511200617481 is a deficient number, since it is larger than the sum of its proper divisors (1229310).

1511200617481 is an frugal number, since it uses more digits than its factorization.

1511200617481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458618 (or 1229309 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 37.

It can be divided in two parts, 1511200 and 617481, that added together give a square (2128681 = 1459²).

The spelling of 1511200617481 in words is "one trillion, five hundred eleven billion, two hundred million, six hundred seventeen thousand, four hundred eighty-one".