931990545 has 24 divisors (see below), whose sum is σ = 1671157800. Its totient is φ = 479920896.

The previous prime is 931990537. The next prime is 931990547. The reversal of 931990545 is 545099139.

It is a happy number.

931990545 is a `hidden beast` number, since 9 + 3 + 19 + 90 + 545 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 398241936 + 533748609 = 19956^2 + 23103^2 .

It is not a de Polignac number, because 931990545 - 2³ = 931990537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 931990545.

It is not an unprimeable number, because it can be changed into a prime (931990547) 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 23 ways as a sum of consecutive naturals, for example, 355780 + ... + 358389.

It is an arithmetic number, because the mean of its divisors is an integer number (69631575).

Almost surely, 2^931990545 is an apocalyptic number.

It is an amenable number.

931990545 is a deficient number, since it is larger than the sum of its proper divisors (739167255).

931990545 is a wasteful number, since it uses less digits than its factorization.

931990545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714209 (or 714206 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 931990545 is about 30528.5201901435. The cubic root of 931990545 is about 976.7959167759.

The spelling of 931990545 in words is "nine hundred thirty-one million, nine hundred ninety thousand, five hundred forty-five".