1863631792201 has 3 divisors (see below), whose sum is σ = 1863633157351. Its totient is φ = 1863630427052.

The previous prime is 1863631792153. The next prime is 1863631792271. The reversal of 1863631792201 is 1022971363681.

The square root of 1863631792201 is 1365149.

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., 47983340601 + 1815648451600 = 219051^2 + 1347460^2 .

It is not a de Polignac number, because 1863631792201 - 2¹⁵ = 1863631759433 is a prime.

It is a super-2 number, since 2×1863631792201² (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 (1863631792271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 682575 + ... + 2047723.

Almost surely, 2^{1863631792201} is an apocalyptic number.

1863631792201 is the 1365149-th square number.

1863631792201 is the 682575-th centered octagonal number.

It is an amenable number.

1863631792201 is a deficient number, since it is larger than the sum of its proper divisors (1365150).

1863631792201 is an frugal number, since it uses more digits than its factorization.

1863631792201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730298 (or 1365149 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

Multiplying 1863631792201 by its sum of digits (49), we get a square (91317957817849 = 9556043²).

The spelling of 1863631792201 in words is "one trillion, eight hundred sixty-three billion, six hundred thirty-one million, seven hundred ninety-two thousand, two hundred one".