31343121577 has 2 divisors, whose sum is σ = 31343121578. Its totient is φ = 31343121576.

The previous prime is 31343121437. The next prime is 31343121581. The reversal of 31343121577 is 77512134313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23554882576 + 7788239001 = 153476^2 + 88251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31343121577 is a prime.

It is not a weakly prime, because it can be changed into another prime (31343121377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15671560788 + 15671560789.

It is an arithmetic number, because the mean of its divisors is an integer number (15671560789).

Almost surely, 2^31343121577 is an apocalyptic number.

It is an amenable number.

31343121577 is a deficient number, since it is larger than the sum of its proper divisors (1).

31343121577 is an equidigital number, since it uses as much as digits as its factorization.

31343121577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 37.

The spelling of 31343121577 in words is "thirty-one billion, three hundred forty-three million, one hundred twenty-one thousand, five hundred seventy-seven".