31275005 has 18 divisors (see below), whose sum is σ = 39108654. Its totient is φ = 24009600.

The previous prime is 31274989. The next prime is 31275029. The reversal of 31275005 is 50057213.

It can be written as a sum of positive squares in 9 ways, for example, as 31158724 + 116281 = 5582^2 + 341^2 .

It is not a de Polignac number, because 31275005 - 2⁴ = 31274989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 512675 + ... + 512735.

It is an arithmetic number, because the mean of its divisors is an integer number (2172703).

Almost surely, 2^31275005 is an apocalyptic number.

It is an amenable number.

31275005 is a deficient number, since it is larger than the sum of its proper divisors (7833649).

31275005 is an frugal number, since it uses more digits than its factorization.

31275005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 31275005 is about 5592.4060117270. The cubic root of 31275005 is about 315.0642516117.

The spelling of 31275005 in words is "thirty-one million, two hundred seventy-five thousand, five".