23361991 has 2 divisors, whose sum is σ = 23361992. Its totient is φ = 23361990.

The previous prime is 23361983. The next prime is 23362021. The reversal of 23361991 is 19916332.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23361991 - 2³ = 23361983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23361691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11680995 + 11680996.

It is an arithmetic number, because the mean of its divisors is an integer number (11680996).

Almost surely, 2^23361991 is an apocalyptic number.

23361991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23361991 is an equidigital number, since it uses as much as digits as its factorization.

23361991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 23361991 is about 4833.4243554648. The cubic root of 23361991 is about 285.8709011944.

The spelling of 23361991 in words is "twenty-three million, three hundred sixty-one thousand, nine hundred ninety-one".