31128201 has 12 divisors (see below), whose sum is σ = 48421828. Its totient is φ = 19155744.

The previous prime is 31128193. The next prime is 31128203. The reversal of 31128201 is 10282113.

It can be written as a sum of positive squares in 2 ways, for example, as 13286025 + 17842176 = 3645^2 + 4224^2 .

It is not a de Polignac number, because 31128201 - 2³ = 31128193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31128203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132910 + ... + 133143.

Almost surely, 2^31128201 is an apocalyptic number.

It is an amenable number.

31128201 is a deficient number, since it is larger than the sum of its proper divisors (17293627).

31128201 is a wasteful number, since it uses less digits than its factorization.

31128201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266072 (or 266069 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 31128201 is about 5579.2652742095. The cubic root of 31128201 is about 314.5705106693.

It can be divided in two parts, 31128 and 201, that added together give a square (31329 = 177²).

The spelling of 31128201 in words is "thirty-one million, one hundred twenty-eight thousand, two hundred one".