31431090 has 16 divisors (see below), whose sum is σ = 75434688. Its totient is φ = 8381616.

The previous prime is 31431031. The next prime is 31431121. The reversal of 31431090 is 9013413.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523822 + ... + 523881.

It is an arithmetic number, because the mean of its divisors is an integer number (4714668).

Almost surely, 2^31431090 is an apocalyptic number.

31431090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31431090 is an abundant number, since it is smaller than the sum of its proper divisors (44003598).

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

31431090 is a wasteful number, since it uses less digits than its factorization.

31431090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047713.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31431090 is about 5606.3437283135. The cubic root of 31431090 is about 315.5875152686.

The spelling of 31431090 in words is "thirty-one million, four hundred thirty-one thousand, ninety".