31145970 has 16 divisors (see below), whose sum is σ = 74750400. Its totient is φ = 8305584.

The previous prime is 31145957. The next prime is 31145977. The reversal of 31145970 is 7954113.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1038199 = 31145970 / (3 + 1 + 1 + 4 + 5 + 9 + 7 + 0).

It is not an unprimeable number, because it can be changed into a prime (31145977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519070 + ... + 519129.

It is an arithmetic number, because the mean of its divisors is an integer number (4671900).

Almost surely, 2^31145970 is an apocalyptic number.

31145970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31145970 is an abundant number, since it is smaller than the sum of its proper divisors (43604430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31145970 is a wasteful number, since it uses less digits than its factorization.

31145970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038209.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 31145970 is about 5580.8574610001. The cubic root of 31145970 is about 314.6303550118.

The spelling of 31145970 in words is "thirty-one million, one hundred forty-five thousand, nine hundred seventy".