31455961 has 2 divisors, whose sum is σ = 31455962. Its totient is φ = 31455960.

The previous prime is 31455959. The next prime is 31456003. The reversal of 31455961 is 16955413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26460736 + 4995225 = 5144^2 + 2235^2 .

It is an emirp because it is prime and its reverse (16955413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31455961 - 2¹ = 31455959 is a prime.

Together with 31455959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31455901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15727980 + 15727981.

It is an arithmetic number, because the mean of its divisors is an integer number (15727981).

Almost surely, 2^31455961 is an apocalyptic number.

It is an amenable number.

31455961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31455961 is an equidigital number, since it uses as much as digits as its factorization.

31455961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 31455961 is about 5608.5614019996. The cubic root of 31455961 is about 315.6707333789.

The spelling of 31455961 in words is "thirty-one million, four hundred fifty-five thousand, nine hundred sixty-one".