31107889 has 4 divisors (see below), whose sum is σ = 31866660. Its totient is φ = 30349120.

The previous prime is 31107863. The next prime is 31107913. The reversal of 31107889 is 98870113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10131489 + 20976400 = 3183^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 31107889 - 2¹³ = 31099697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31107829) 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, 379324 + ... + 379405.

It is an arithmetic number, because the mean of its divisors is an integer number (7966665).

Almost surely, 2^31107889 is an apocalyptic number.

It is an amenable number.

31107889 is a deficient number, since it is larger than the sum of its proper divisors (758771).

31107889 is an equidigital number, since it uses as much as digits as its factorization.

31107889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758770.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 31107889 is about 5577.4446657945. Note that the first 3 decimals coincide. The cubic root of 31107889 is about 314.5020738361.

The spelling of 31107889 in words is "thirty-one million, one hundred seven thousand, eight hundred eighty-nine".