31969489 has 2 divisors, whose sum is σ = 31969490. Its totient is φ = 31969488.

The previous prime is 31969453. The next prime is 31969529. The reversal of 31969489 is 98496913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27217089 + 4752400 = 5217^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 31969489 - 2¹⁹ = 31445201 is a prime.

It is a super-2 number, since 2×31969489² = 2044096453842242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31969409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15984744 + 15984745.

It is an arithmetic number, because the mean of its divisors is an integer number (15984745).

Almost surely, 2^31969489 is an apocalyptic number.

It is an amenable number.

31969489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31969489 is an equidigital number, since it uses as much as digits as its factorization.

31969489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 31969489 is about 5654.1567894780. The cubic root of 31969489 is about 317.3792758211.

The spelling of 31969489 in words is "thirty-one million, nine hundred sixty-nine thousand, four hundred eighty-nine".