31128045 has 16 divisors (see below), whose sum is σ = 53636352. Its totient is φ = 15324480.

The previous prime is 31128043. The next prime is 31128047. The reversal of 31128045 is 54082113.

It is an interprime number because it is at equal distance from previous prime (31128043) and next prime (31128047).

It is not a de Polignac number, because 31128045 - 2¹ = 31128043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31128043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79621 + ... + 80010.

It is an arithmetic number, because the mean of its divisors is an integer number (3352272).

Almost surely, 2^31128045 is an apocalyptic number.

It is an amenable number.

31128045 is a deficient number, since it is larger than the sum of its proper divisors (22508307).

31128045 is a wasteful number, since it uses less digits than its factorization.

31128045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159652.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 31128045 is about 5579.2512938566. The cubic root of 31128045 is about 314.5699851750.

The spelling of 31128045 in words is "thirty-one million, one hundred twenty-eight thousand, forty-five".