31020609 has 4 divisors (see below), whose sum is σ = 41360816. Its totient is φ = 20680404.

The previous prime is 31020599. The next prime is 31020617. The reversal of 31020609 is 90602013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31020609 - 2⁴ = 31020593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020659) 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, 5170099 + ... + 5170104.

It is an arithmetic number, because the mean of its divisors is an integer number (10340204).

Almost surely, 2^31020609 is an apocalyptic number.

It is an amenable number.

31020609 is a deficient number, since it is larger than the sum of its proper divisors (10340207).

31020609 is a wasteful number, since it uses less digits than its factorization.

31020609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340206.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31020609 is about 5569.6147981705. The cubic root of 31020609 is about 314.2076634891.

The spelling of 31020609 in words is "thirty-one million, twenty thousand, six hundred nine".