31988045 has 4 divisors (see below), whose sum is σ = 38385660. Its totient is φ = 25590432.

The previous prime is 31988041. The next prime is 31988051. The reversal of 31988045 is 54088913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54088913 = 1033 ⋅52361.

It can be written as a sum of positive squares in 2 ways, for example, as 3290596 + 28697449 = 1814^2 + 5357^2 .

It is a cyclic number.

It is not a de Polignac number, because 31988045 - 2² = 31988041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31988041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3198800 + ... + 3198809.

It is an arithmetic number, because the mean of its divisors is an integer number (9596415).

Almost surely, 2^31988045 is an apocalyptic number.

It is an amenable number.

31988045 is a deficient number, since it is larger than the sum of its proper divisors (6397615).

31988045 is an equidigital number, since it uses as much as digits as its factorization.

31988045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6397614.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 31988045 is about 5655.7974680853. The cubic root of 31988045 is about 317.4406692617.

The spelling of 31988045 in words is "thirty-one million, nine hundred eighty-eight thousand, forty-five".