261220992931 has 8 divisors (see below), whose sum is σ = 261478577600. Its totient is φ = 260963496360.

The previous prime is 261220992917. The next prime is 261220992943. The reversal of 261220992931 is 139299022162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261220992931 - 2³⁵ = 226861254563 is a prime.

It is a super-2 number, since 2×261220992931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261220992961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6977260 + ... + 7014598.

It is an arithmetic number, because the mean of its divisors is an integer number (32684822200).

Almost surely, 2^261220992931 is an apocalyptic number.

261220992931 is a deficient number, since it is larger than the sum of its proper divisors (257584669).

261220992931 is a wasteful number, since it uses less digits than its factorization.

261220992931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44049.

The product of its (nonzero) digits is 209952, while the sum is 46.

The spelling of 261220992931 in words is "two hundred sixty-one billion, two hundred twenty million, nine hundred ninety-two thousand, nine hundred thirty-one".