261624957 has 16 divisors (see below), whose sum is σ = 382976832. Its totient is φ = 157547520.

The previous prime is 261624941. The next prime is 261624971. The reversal of 261624957 is 759426162.

It is not a de Polignac number, because 261624957 - 2⁴ = 261624941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261624257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20068 + ... + 30429.

It is an arithmetic number, because the mean of its divisors is an integer number (23936052).

Almost surely, 2^261624957 is an apocalyptic number.

It is an amenable number.

261624957 is a deficient number, since it is larger than the sum of its proper divisors (121351875).

261624957 is a wasteful number, since it uses less digits than its factorization.

261624957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50668.

The product of its digits is 181440, while the sum is 42.

The square root of 261624957 is about 16174.8247903957. The cubic root of 261624957 is about 639.5773226365.

The spelling of 261624957 in words is "two hundred sixty-one million, six hundred twenty-four thousand, nine hundred fifty-seven".