1520281602009 has 9 divisors (see below), whose sum is σ = 2195967657013. Its totient is φ = 1013518602012.

The previous prime is 1520281601977. The next prime is 1520281602019. The reversal of 1520281602009 is 9002061820251.

The square root of 1520281602009 is 1232997.

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

1520281602009 is a `hidden beast` number, since 1 + 5 + 20 + 28 + 1 + 602 + 0 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1520281602009 - 2⁵ = 1520281601977 is a prime.

It is a super-2 number, since 2×1520281602009² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1520281602019) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3493492 + ... + 3904490.

Almost surely, 2^{1520281602009} is an apocalyptic number.

1520281602009 is the 1232997-th square number.

1520281602009 is the 616499-th centered octagonal number.

It is an amenable number.

1520281602009 is a deficient number, since it is larger than the sum of its proper divisors (675686055004).

1520281602009 is an frugal number, since it uses more digits than its factorization.

1520281602009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822004 (or 411002 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

Multiplying 1520281602009 by its sum of digits (36), we get a square (54730137672324 = 7397982²).

The spelling of 1520281602009 in words is "one trillion, five hundred twenty billion, two hundred eighty-one million, six hundred two thousand, nine".