23161977 has 8 divisors (see below), whose sum is σ = 34314080. Its totient is φ = 15441300.

The previous prime is 23161961. The next prime is 23162003. The reversal of 23161977 is 77916132.

It is a happy number.

23161977 is a `hidden beast` number, since 2 + 31 + 619 + 7 + 7 = 666.

It is not a de Polignac number, because 23161977 - 2⁴ = 23161961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23161927) by changing a digit.

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, 428899 + ... + 428952.

It is an arithmetic number, because the mean of its divisors is an integer number (4289260).

Almost surely, 2^23161977 is an apocalyptic number.

23161977 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

23161977 is a deficient number, since it is larger than the sum of its proper divisors (11152103).

23161977 is an equidigital number, since it uses as much as digits as its factorization.

23161977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857860 (or 857854 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 23161977 is about 4812.6891651134. The cubic root of 23161977 is about 285.0527326247.

The spelling of 23161977 in words is "twenty-three million, one hundred sixty-one thousand, nine hundred seventy-seven".