31000749 has 32 divisors (see below), whose sum is σ = 46080384. Its totient is φ = 18420480.

The previous prime is 31000693. The next prime is 31000751. The reversal of 31000749 is 94700013.

It is not a de Polignac number, because 31000749 - 2⁷ = 31000621 is a prime.

It is a super-2 number, since 2×31000749² = 1922092877122002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000349) 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, 197379 + ... + 197535.

It is an arithmetic number, because the mean of its divisors is an integer number (1440012).

Almost surely, 2^31000749 is an apocalyptic number.

31000749 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31000749 is a deficient number, since it is larger than the sum of its proper divisors (15079635).

31000749 is a wasteful number, since it uses less digits than its factorization.

31000749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 31000749 is about 5567.8316246094. The cubic root of 31000749 is about 314.1405952124.

The spelling of 31000749 in words is "thirty-one million, seven hundred forty-nine", and thus it is an aban number.