31613489 has 4 divisors (see below), whose sum is σ = 33473124. Its totient is φ = 29753856.

The previous prime is 31613441. The next prime is 31613513. The reversal of 31613489 is 98431613.

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 23203489 + 8410000 = 4817^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 31613489 - 2¹² = 31609393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31615489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929792 + ... + 929825.

It is an arithmetic number, because the mean of its divisors is an integer number (8368281).

Almost surely, 2^31613489 is an apocalyptic number.

It is an amenable number.

31613489 is a deficient number, since it is larger than the sum of its proper divisors (1859635).

31613489 is a wasteful number, since it uses less digits than its factorization.

31613489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859634.

The product of its digits is 15552, while the sum is 35.

The square root of 31613489 is about 5622.5873937183. The cubic root of 31613489 is about 316.1968043132.

The spelling of 31613489 in words is "thirty-one million, six hundred thirteen thousand, four hundred eighty-nine".