261190923 has 24 divisors (see below), whose sum is σ = 408854160. Its totient is φ = 147873600.

The previous prime is 261190913. The next prime is 261190927. The reversal of 261190923 is 329091162.

It is not a de Polignac number, because 261190923 - 2²⁴ = 244413707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261190927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7873 + ... + 24173.

It is an arithmetic number, because the mean of its divisors is an integer number (17035590).

Almost surely, 2^261190923 is an apocalyptic number.

261190923 is a deficient number, since it is larger than the sum of its proper divisors (147663237).

261190923 is a wasteful number, since it uses less digits than its factorization.

261190923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16427 (or 16420 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 261190923 is about 16161.4022597051. The cubic root of 261190923 is about 639.2234420795.

The spelling of 261190923 in words is "two hundred sixty-one million, one hundred ninety thousand, nine hundred twenty-three".