23155213 has 2 divisors, whose sum is σ = 23155214. Its totient is φ = 23155212.

The previous prime is 23155193. The next prime is 23155217. The reversal of 23155213 is 31255132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 11410884 = 3427^2 + 3378^2 .

It is a cyclic number.

It is not a de Polignac number, because 23155213 - 2⁹ = 23154701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23155217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11577606 + 11577607.

It is an arithmetic number, because the mean of its divisors is an integer number (11577607).

Almost surely, 2^23155213 is an apocalyptic number.

It is an amenable number.

23155213 is a deficient number, since it is larger than the sum of its proper divisors (1).

23155213 is an equidigital number, since it uses as much as digits as its factorization.

23155213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 22.

The square root of 23155213 is about 4811.9863881769. The cubic root of 23155213 is about 285.0249819078.

It can be divided in two parts, 23 and 155213, that added together give a square (155236 = 394²).

The spelling of 23155213 in words is "twenty-three million, one hundred fifty-five thousand, two hundred thirteen".