311249473621 has 2 divisors, whose sum is σ = 311249473622. Its totient is φ = 311249473620.

The previous prime is 311249473573. The next prime is 311249473627. The reversal of 311249473621 is 126374942113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309592088100 + 1657385521 = 556410^2 + 40711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311249473621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311249473627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155624736810 + 155624736811.

It is an arithmetic number, because the mean of its divisors is an integer number (155624736811).

Almost surely, 2^311249473621 is an apocalyptic number.

It is an amenable number.

311249473621 is a deficient number, since it is larger than the sum of its proper divisors (1).

311249473621 is an equidigital number, since it uses as much as digits as its factorization.

311249473621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The spelling of 311249473621 in words is "three hundred eleven billion, two hundred forty-nine million, four hundred seventy-three thousand, six hundred twenty-one".