31195261 has 2 divisors, whose sum is σ = 31195262. Its totient is φ = 31195260.

The previous prime is 31195259. The next prime is 31195303. The reversal of 31195261 is 16259113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22231225 + 8964036 = 4715^2 + 2994^2 .

It is a cyclic number.

It is not a de Polignac number, because 31195261 - 2¹ = 31195259 is a prime.

Together with 31195259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31195211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15597630 + 15597631.

It is an arithmetic number, because the mean of its divisors is an integer number (15597631).

Almost surely, 2^31195261 is an apocalyptic number.

It is an amenable number.

31195261 is a deficient number, since it is larger than the sum of its proper divisors (1).

31195261 is an equidigital number, since it uses as much as digits as its factorization.

31195261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 31195261 is about 5585.2717928495. The cubic root of 31195261 is about 314.7962434708.

The spelling of 31195261 in words is "thirty-one million, one hundred ninety-five thousand, two hundred sixty-one".