31187201 has 2 divisors, whose sum is σ = 31187202. Its totient is φ = 31187200.

The previous prime is 31187173. The next prime is 31187203. The reversal of 31187201 is 10278113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29170801 + 2016400 = 5401^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 31187201 - 2⁶ = 31187137 is a prime.

Together with 31187203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31187203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15593600 + 15593601.

It is an arithmetic number, because the mean of its divisors is an integer number (15593601).

Almost surely, 2^31187201 is an apocalyptic number.

It is an amenable number.

31187201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31187201 is an equidigital number, since it uses as much as digits as its factorization.

31187201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 31187201 is about 5584.5502057014. The cubic root of 31187201 is about 314.7691295632.

The spelling of 31187201 in words is "thirty-one million, one hundred eighty-seven thousand, two hundred one".