31961801 has 2 divisors, whose sum is σ = 31961802. Its totient is φ = 31961800.

The previous prime is 31961779. The next prime is 31961803. The reversal of 31961801 is 10816913.

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., 24255625 + 7706176 = 4925^2 + 2776^2 .

It is a cyclic number.

It is not a de Polignac number, because 31961801 - 2²² = 27767497 is a prime.

It is a Sophie Germain prime.

Together with 31961803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31961803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15980900 + 15980901.

It is an arithmetic number, because the mean of its divisors is an integer number (15980901).

Almost surely, 2^31961801 is an apocalyptic number.

It is an amenable number.

31961801 is a deficient number, since it is larger than the sum of its proper divisors (1).

31961801 is an equidigital number, since it uses as much as digits as its factorization.

31961801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 31961801 is about 5653.4768947967. The cubic root of 31961801 is about 317.3538327339.

The spelling of 31961801 in words is "thirty-one million, nine hundred sixty-one thousand, eight hundred one".