31031201 has 2 divisors, whose sum is σ = 31031202. Its totient is φ = 31031200.

The previous prime is 31031083. The next prime is 31031257. The reversal of 31031201 is 10213013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 1437601 = 5440^2 + 1199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31031201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31031501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15515600 + 15515601.

It is an arithmetic number, because the mean of its divisors is an integer number (15515601).

Almost surely, 2^31031201 is an apocalyptic number.

It is an amenable number.

31031201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31031201 is an equidigital number, since it uses as much as digits as its factorization.

31031201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 31031201 is about 5570.5655906739. The cubic root of 31031201 is about 314.2434215325.

Adding to 31031201 its reverse (10213013), we get a palindrome (41244214).

The spelling of 31031201 in words is "thirty-one million, thirty-one thousand, two hundred one".