23361981 has 4 divisors (see below), whose sum is σ = 31149312. Its totient is φ = 15574652.

The previous prime is 23361979. The next prime is 23361983. The reversal of 23361981 is 18916332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (23361979) and next prime (23361983).

It is a cyclic number.

It is not a de Polignac number, because 23361981 - 2¹ = 23361979 is a prime.

It is a super-2 number, since 2×23361981² = 1091564312488722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23361983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3893661 + ... + 3893666.

It is an arithmetic number, because the mean of its divisors is an integer number (7787328).

Almost surely, 2^23361981 is an apocalyptic number.

It is an amenable number.

23361981 is a deficient number, since it is larger than the sum of its proper divisors (7787331).

23361981 is an equidigital number, since it uses as much as digits as its factorization.

23361981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7787330.

The product of its digits is 7776, while the sum is 33.

The square root of 23361981 is about 4833.4233210014. The cubic root of 23361981 is about 285.8708604058.

It can be divided in two parts, 23361 and 981, that added together give a palindrome (24342).

The spelling of 23361981 in words is "twenty-three million, three hundred sixty-one thousand, nine hundred eighty-one".