23135657 has 4 divisors (see below), whose sum is σ = 24496596. Its totient is φ = 21774720.

The previous prime is 23135633. The next prime is 23135681. The reversal of 23135657 is 75653132.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (23135633) and next prime (23135681).

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 3279721 = 4456^2 + 1811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23135657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23135617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680444 + ... + 680477.

It is an arithmetic number, because the mean of its divisors is an integer number (6124149).

Almost surely, 2^23135657 is an apocalyptic number.

It is an amenable number.

23135657 is a deficient number, since it is larger than the sum of its proper divisors (1360939).

23135657 is a wasteful number, since it uses less digits than its factorization.

23135657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360938.

The product of its digits is 18900, while the sum is 32.

The square root of 23135657 is about 4809.9539498835. The cubic root of 23135657 is about 284.9447189383.

Adding to 23135657 its reverse (75653132), we get a palindrome (98788789).

The spelling of 23135657 in words is "twenty-three million, one hundred thirty-five thousand, six hundred fifty-seven".