31335399961 has 2 divisors, whose sum is σ = 31335399962. Its totient is φ = 31335399960.

The previous prime is 31335399959. The next prime is 31335399983. The reversal of 31335399961 is 16999353313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16888561936 + 14446838025 = 129956^2 + 120195^2 .

It is a cyclic number.

It is not a de Polignac number, because 31335399961 - 2¹ = 31335399959 is a prime.

Together with 31335399959, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31335399899 and 31335399908.

It is not a weakly prime, because it can be changed into another prime (31335799961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15667699980 + 15667699981.

It is an arithmetic number, because the mean of its divisors is an integer number (15667699981).

Almost surely, 2^31335399961 is an apocalyptic number.

It is an amenable number.

31335399961 is a deficient number, since it is larger than the sum of its proper divisors (1).

31335399961 is an equidigital number, since it uses as much as digits as its factorization.

31335399961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1771470, while the sum is 52.

It can be divided in two parts, 313353 and 99961, that added together give a palindrome (413314).

The spelling of 31335399961 in words is "thirty-one billion, three hundred thirty-five million, three hundred ninety-nine thousand, nine hundred sixty-one".