23715551 has 2 divisors, whose sum is σ = 23715552. Its totient is φ = 23715550.

The previous prime is 23715547. The next prime is 23715569. The reversal of 23715551 is 15551732.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23715551 - 2² = 23715547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23715511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11857775 + 11857776.

It is an arithmetic number, because the mean of its divisors is an integer number (11857776).

Almost surely, 2^23715551 is an apocalyptic number.

23715551 is a deficient number, since it is larger than the sum of its proper divisors (1).

23715551 is an equidigital number, since it uses as much as digits as its factorization.

23715551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 29.

The square root of 23715551 is about 4869.8614970038. The cubic root of 23715551 is about 287.3058086239.

The spelling of 23715551 in words is "twenty-three million, seven hundred fifteen thousand, five hundred fifty-one".