23261557 has 8 divisors (see below), whose sum is σ = 25792992. Its totient is φ = 20799600.

The previous prime is 23261549. The next prime is 23261573. The reversal of 23261557 is 75516232.

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 23261557 - 2³ = 23261549 is a prime.

It is a super-2 number, since 2×23261557² = 1082200068128498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23261657) 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, 16663 + ... + 18004.

It is an arithmetic number, because the mean of its divisors is an integer number (3224124).

Almost surely, 2^23261557 is an apocalyptic number.

It is an amenable number.

23261557 is a deficient number, since it is larger than the sum of its proper divisors (2531435).

23261557 is a wasteful number, since it uses less digits than its factorization.

23261557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34739.

The product of its digits is 12600, while the sum is 31.

The square root of 23261557 is about 4823.0236366827. The cubic root of 23261557 is about 285.4606564789.

Adding to 23261557 its reverse (75516232), we get a palindrome (98777789).

It can be divided in two parts, 2326 and 1557, that added together give a palindrome (3883).

The spelling of 23261557 in words is "twenty-three million, two hundred sixty-one thousand, five hundred fifty-seven".