23155019 has 2 divisors, whose sum is σ = 23155020. Its totient is φ = 23155018.

The previous prime is 23155009. The next prime is 23155049. The reversal of 23155019 is 91055132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23155019 - 2⁸ = 23154763 is a prime.

It is a super-2 number, since 2×23155019² = 1072309809780722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23155009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11577509 + 11577510.

It is an arithmetic number, because the mean of its divisors is an integer number (11577510).

Almost surely, 2^23155019 is an apocalyptic number.

23155019 is a deficient number, since it is larger than the sum of its proper divisors (1).

23155019 is an equidigital number, since it uses as much as digits as its factorization.

23155019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 23155019 is about 4811.9662301392. The cubic root of 23155019 is about 285.0241859027.

The spelling of 23155019 in words is "twenty-three million, one hundred fifty-five thousand, nineteen".