23105531 has 2 divisors, whose sum is σ = 23105532. Its totient is φ = 23105530.

The previous prime is 23105527. The next prime is 23105543. The reversal of 23105531 is 13550132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23105531 - 2² = 23105527 is a prime.

It is a super-2 number, since 2×23105531² = 1067731125583922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (23105581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11552765 + 11552766.

It is an arithmetic number, because the mean of its divisors is an integer number (11552766).

Almost surely, 2^23105531 is an apocalyptic number.

23105531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23105531 is an equidigital number, since it uses as much as digits as its factorization.

23105531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 23105531 is about 4806.8212989459. The cubic root of 23105531 is about 284.8209853543.

Adding to 23105531 its reverse (13550132), we get a palindrome (36655663).

The spelling of 23105531 in words is "twenty-three million, one hundred five thousand, five hundred thirty-one".