31131201 has 4 divisors (see below), whose sum is σ = 41508272. Its totient is φ = 20754132.

The previous prime is 31131197. The next prime is 31131211. The reversal of 31131201 is 10213113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31131201 - 2² = 31131197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5188531 + ... + 5188536.

It is an arithmetic number, because the mean of its divisors is an integer number (10377068).

Almost surely, 2^31131201 is an apocalyptic number.

It is an amenable number.

31131201 is a deficient number, since it is larger than the sum of its proper divisors (10377071).

31131201 is a wasteful number, since it uses less digits than its factorization.

31131201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10377070.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31131201 is about 5579.5341203366. The cubic root of 31131201 is about 314.5806159885.

Adding to 31131201 its reverse (10213113), we get a palindrome (41344314).

The spelling of 31131201 in words is "thirty-one million, one hundred thirty-one thousand, two hundred one".