31343609 has 4 divisors (see below), whose sum is σ = 34193040. Its totient is φ = 28494180.

The previous prime is 31343591. The next prime is 31343651. The reversal of 31343609 is 90634313.

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 31343609 - 2¹² = 31339513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31343509) 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, 1424699 + ... + 1424720.

It is an arithmetic number, because the mean of its divisors is an integer number (8548260).

Almost surely, 2^31343609 is an apocalyptic number.

It is an amenable number.

31343609 is a deficient number, since it is larger than the sum of its proper divisors (2849431).

31343609 is a wasteful number, since it uses less digits than its factorization.

31343609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849430.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 31343609 is about 5598.5363265768. The cubic root of 31343609 is about 315.2944554939.

The spelling of 31343609 in words is "thirty-one million, three hundred forty-three thousand, six hundred nine".