31020090 has 16 divisors (see below), whose sum is σ = 74448288. Its totient is φ = 8272016.

The previous prime is 31020089. The next prime is 31020091. The reversal of 31020090 is 9002013.

It is an interprime number because it is at equal distance from previous prime (31020089) and next prime (31020091).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (31020091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516972 + ... + 517031.

It is an arithmetic number, because the mean of its divisors is an integer number (4653018).

Almost surely, 2^31020090 is an apocalyptic number.

31020090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31020090 is an abundant number, since it is smaller than the sum of its proper divisors (43428198).

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

31020090 is a wasteful number, since it uses less digits than its factorization.

31020090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034013.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 31020090 is about 5569.5682058845. The cubic root of 31020090 is about 314.2059111628.

The spelling of 31020090 in words is "thirty-one million, twenty thousand, ninety".