31672289 has 4 divisors (see below), whose sum is σ = 34551600. Its totient is φ = 28792980.

The previous prime is 31672273. The next prime is 31672331. The reversal of 31672289 is 98227613.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98227613 = 11 ⋅8929783.

It is a cyclic number.

It is not a de Polignac number, because 31672289 - 2⁴ = 31672273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31672229) 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, 1439639 + ... + 1439660.

It is an arithmetic number, because the mean of its divisors is an integer number (8637900).

Almost surely, 2^31672289 is an apocalyptic number.

It is an amenable number.

31672289 is a deficient number, since it is larger than the sum of its proper divisors (2879311).

31672289 is a wasteful number, since it uses less digits than its factorization.

31672289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879310.

The product of its digits is 36288, while the sum is 38.

The square root of 31672289 is about 5627.8138739656. The cubic root of 31672289 is about 316.3927212833.

The spelling of 31672289 in words is "thirty-one million, six hundred seventy-two thousand, two hundred eighty-nine".