31739489 has 2 divisors, whose sum is σ = 31739490. Its totient is φ = 31739488.

The previous prime is 31739483. The next prime is 31739569. The reversal of 31739489 is 98493713.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 1982464 = 5455^2 + 1408^2 .

It is an emirp because it is prime and its reverse (98493713) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31739489 - 2⁸ = 31739233 is a prime.

It is a super-2 number, since 2×31739489² = 2014790323962242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31739483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15869744 + 15869745.

It is an arithmetic number, because the mean of its divisors is an integer number (15869745).

Almost surely, 2^31739489 is an apocalyptic number.

It is an amenable number.

31739489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31739489 is an equidigital number, since it uses as much as digits as its factorization.

31739489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 31739489 is about 5633.7810571587. The cubic root of 31739489 is about 316.6163297028.

The spelling of 31739489 in words is "thirty-one million, seven hundred thirty-nine thousand, four hundred eighty-nine".