23691861 has 6 divisors (see below), whose sum is σ = 34221590. Its totient is φ = 15794568.

The previous prime is 23691859. The next prime is 23691881. The reversal of 23691861 is 16819632.

It can be written as a sum of positive squares in only one way, i.e., 22752900 + 938961 = 4770^2 + 969^2 .

It is not a de Polignac number, because 23691861 - 2¹ = 23691859 is a prime.

It is a super-2 number, since 2×23691861² = 1122608555286642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23691881) 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 in 5 ways as a sum of consecutive naturals, for example, 1316206 + ... + 1316223.

Almost surely, 2^23691861 is an apocalyptic number.

It is an amenable number.

23691861 is a deficient number, since it is larger than the sum of its proper divisors (10529729).

23691861 is a wasteful number, since it uses less digits than its factorization.

23691861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632435 (or 2632432 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 23691861 is about 4867.4285819106. The cubic root of 23691861 is about 287.2101113297.

The spelling of 23691861 in words is "twenty-three million, six hundred ninety-one thousand, eight hundred sixty-one".