31201901 has 2 divisors, whose sum is σ = 31201902. Its totient is φ = 31201900.

The previous prime is 31201867. The next prime is 31201909. The reversal of 31201901 is 10910213.

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., 30261001 + 940900 = 5501^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 31201901 - 2²² = 27007597 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31201901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31201909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600950 + 15600951.

It is an arithmetic number, because the mean of its divisors is an integer number (15600951).

Almost surely, 2^31201901 is an apocalyptic number.

It is an amenable number.

31201901 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201901 is an equidigital number, since it uses as much as digits as its factorization.

31201901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 31201901 is about 5585.8661817126. The cubic root of 31201901 is about 314.8185769781.

The spelling of 31201901 in words is "thirty-one million, two hundred one thousand, nine hundred one".