31940231 has 4 divisors (see below), whose sum is σ = 32299200. Its totient is φ = 31581264.

The previous prime is 31940219. The next prime is 31940243. The reversal of 31940231 is 13204913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13204913 = 43 ⋅307091.

It is an interprime number because it is at equal distance from previous prime (31940219) and next prime (31940243).

It is a cyclic number.

It is not a de Polignac number, because 31940231 - 2¹⁴ = 31923847 is a prime.

It is a super-2 number, since 2×31940231² = 2040356712666722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31940197 and 31940206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31942231) 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, 179351 + ... + 179528.

It is an arithmetic number, because the mean of its divisors is an integer number (8074800).

Almost surely, 2^31940231 is an apocalyptic number.

31940231 is a deficient number, since it is larger than the sum of its proper divisors (358969).

31940231 is an equidigital number, since it uses as much as digits as its factorization.

31940231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358968.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31940231 is about 5651.5688972178. The cubic root of 31940231 is about 317.2824260084.

The spelling of 31940231 in words is "thirty-one million, nine hundred forty thousand, two hundred thirty-one".