23311989 has 16 divisors (see below), whose sum is σ = 34632000. Its totient is φ = 15498288.

The previous prime is 23311987. The next prime is 23311991. The reversal of 23311989 is 98911332.

It is an interprime number because it is at equal distance from previous prime (23311987) and next prime (23311991).

It is not a de Polignac number, because 23311989 - 2¹ = 23311987 is a prime.

It is a super-2 number, since 2×23311989² = 1086897662272242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10987 + ... + 12935.

It is an arithmetic number, because the mean of its divisors is an integer number (2164500).

Almost surely, 2^23311989 is an apocalyptic number.

It is an amenable number.

23311989 is a deficient number, since it is larger than the sum of its proper divisors (11320011).

23311989 is a wasteful number, since it uses less digits than its factorization.

23311989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401 (or 2395 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 23311989 is about 4828.2490615129. The cubic root of 23311989 is about 285.6668043359. Note that the first 3 decimals are identical.

The spelling of 23311989 in words is "twenty-three million, three hundred eleven thousand, nine hundred eighty-nine".