23191961 has 12 divisors (see below), whose sum is σ = 26535852. Its totient is φ = 20145408.

The previous prime is 23191957. The next prime is 23191963. The reversal of 23191961 is 16919132.

It can be written as a sum of positive squares in 6 ways, for example, as 1392400 + 21799561 = 1180^2 + 4669^2 .

It is not a de Polignac number, because 23191961 - 2² = 23191957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23191963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 671 + ... + 6843.

It is an arithmetic number, because the mean of its divisors is an integer number (2211321).

Almost surely, 2^23191961 is an apocalyptic number.

It is an amenable number.

23191961 is a deficient number, since it is larger than the sum of its proper divisors (3343891).

23191961 is a wasteful number, since it uses less digits than its factorization.

23191961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6220 (or 6203 counting only the distinct ones).

The product of its digits is 2916, while the sum is 32.

The square root of 23191961 is about 4815.8032559481. The cubic root of 23191961 is about 285.1756832065.

The spelling of 23191961 in words is "twenty-three million, one hundred ninety-one thousand, nine hundred sixty-one".