31486431 has 32 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 18708480.

The previous prime is 31486423. The next prime is 31486451. The reversal of 31486431 is 13468413.

It is not a de Polignac number, because 31486431 - 2³ = 31486423 is a prime.

It is a super-2 number, since 2×31486431² = 1982790674235522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31486451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90045 + ... + 90393.

It is an arithmetic number, because the mean of its divisors is an integer number (1464750).

Almost surely, 2^31486431 is an apocalyptic number.

31486431 is a deficient number, since it is larger than the sum of its proper divisors (15385569).

31486431 is a wasteful number, since it uses less digits than its factorization.

31486431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459.

The product of its digits is 6912, while the sum is 30.

The square root of 31486431 is about 5611.2771273570. The cubic root of 31486431 is about 315.7726259184.

The spelling of 31486431 in words is "thirty-one million, four hundred eighty-six thousand, four hundred thirty-one".