23861531 has 2 divisors, whose sum is σ = 23861532. Its totient is φ = 23861530.

The previous prime is 23861527. The next prime is 23861533. The reversal of 23861531 is 13516832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23861531 - 2² = 23861527 is a prime.

It is a super-2 number, since 2×23861531² = 1138745323327922, which contains 22 as substring.

Together with 23861533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23861494 and 23861503.

It is not a weakly prime, because it can be changed into another prime (23861533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11930765 + 11930766.

It is an arithmetic number, because the mean of its divisors is an integer number (11930766).

Almost surely, 2^23861531 is an apocalyptic number.

23861531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23861531 is an equidigital number, since it uses as much as digits as its factorization.

23861531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 23861531 is about 4884.8266090006. The cubic root of 23861531 is about 287.8941024951.

The spelling of 23861531 in words is "twenty-three million, eight hundred sixty-one thousand, five hundred thirty-one".