31000890 has 16 divisors (see below), whose sum is σ = 74402208. Its totient is φ = 8266896.

The previous prime is 31000889. The next prime is 31000891. The reversal of 31000890 is 9800013.

It is an interprime number because it is at equal distance from previous prime (31000889) and next prime (31000891).

It is a super-2 number, since 2×31000890² = 1922110361584200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000891) 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, 516652 + ... + 516711.

It is an arithmetic number, because the mean of its divisors is an integer number (4650138).

Almost surely, 2^31000890 is an apocalyptic number.

31000890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31000890 is an abundant number, since it is smaller than the sum of its proper divisors (43401318).

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

31000890 is a wasteful number, since it uses less digits than its factorization.

31000890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033373.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31000890 is about 5567.8442866158. The cubic root of 31000890 is about 314.1410714779.

The spelling of 31000890 in words is "thirty-one million, eight hundred ninety", and thus it is an aban number.