23155519 has 2 divisors, whose sum is σ = 23155520. Its totient is φ = 23155518.

The previous prime is 23155507. The next prime is 23155523. The reversal of 23155519 is 91555132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23155519 - 2⁵ = 23155487 is a prime.

It is a super-2 number, since 2×23155519² = 1072356120318722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23155579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11577759 + 11577760.

It is an arithmetic number, because the mean of its divisors is an integer number (11577760).

Almost surely, 2^23155519 is an apocalyptic number.

23155519 is a deficient number, since it is larger than the sum of its proper divisors (1).

23155519 is an equidigital number, since it uses as much as digits as its factorization.

23155519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 31.

The square root of 23155519 is about 4812.0181836730. The cubic root of 23155519 is about 285.0262374532.

The spelling of 23155519 in words is "twenty-three million, one hundred fifty-five thousand, five hundred nineteen".