263631929401 has 9 divisors (see below), whose sum is σ = 280061183791. Its totient is φ = 248115953632.

The previous prime is 263631929399. The next prime is 263631929411. The reversal of 263631929401 is 104929136362.

The square root of 263631929401 is 513451.

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

It can be written as a sum of positive squares in only one way, i.e., 205249772025 + 58382157376 = 453045^2 + 241624^2 .

It is not a de Polignac number, because 263631929401 - 2¹ = 263631929399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263631929411) 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, 8713566 + ... + 8743768.

Almost surely, 2^263631929401 is an apocalyptic number.

263631929401 is the 513451-st square number.

263631929401 is the 256726-th centered octagonal number.

It is an amenable number.

263631929401 is a deficient number, since it is larger than the sum of its proper divisors (16429254390).

263631929401 is an frugal number, since it uses more digits than its factorization.

263631929401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60440 (or 30220 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 46.

The spelling of 263631929401 in words is "two hundred sixty-three billion, six hundred thirty-one million, nine hundred twenty-nine thousand, four hundred one".