23131555 has 8 divisors (see below), whose sum is σ = 27806832. Its totient is φ = 18472608.

The previous prime is 23131547. The next prime is 23131573. The reversal of 23131555 is 55513132.

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 23131555 - 2³ = 23131547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (3475854).

Almost surely, 2^23131555 is an apocalyptic number.

23131555 is a deficient number, since it is larger than the sum of its proper divisors (4675277).

23131555 is an equidigital number, since it uses as much as digits as its factorization.

23131555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165.

The product of its digits is 2250, while the sum is 25.

The square root of 23131555 is about 4809.5275235724. The cubic root of 23131555 is about 284.9278775129.

Adding to 23131555 its reverse (55513132), we get a palindrome (78644687).

The spelling of 23131555 in words is "twenty-three million, one hundred thirty-one thousand, five hundred fifty-five".