31282961 has 2 divisors, whose sum is σ = 31282962. Its totient is φ = 31282960.

The previous prime is 31282957. The next prime is 31282963. The reversal of 31282961 is 16928213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 591361 = 5540^2 + 769^2 .

It is a cyclic number.

It is not a de Polignac number, because 31282961 - 2² = 31282957 is a prime.

Together with 31282963, 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 (31282963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15641480 + 15641481.

It is an arithmetic number, because the mean of its divisors is an integer number (15641481).

Almost surely, 2^31282961 is an apocalyptic number.

It is an amenable number.

31282961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31282961 is an equidigital number, since it uses as much as digits as its factorization.

31282961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 31282961 is about 5593.1172882392. The cubic root of 31282961 is about 315.0909655820.

The spelling of 31282961 in words is "thirty-one million, two hundred eighty-two thousand, nine hundred sixty-one".