10311821557 has 2 divisors, whose sum is σ = 10311821558. Its totient is φ = 10311821556.

The previous prime is 10311821501. The next prime is 10311821581. The reversal of 10311821557 is 75512811301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8903620881 + 1408200676 = 94359^2 + 37526^2 .

It is an emirp because it is prime and its reverse (75512811301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10311821557 - 2²⁷ = 10177603829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10311821957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5155910778 + 5155910779.

It is an arithmetic number, because the mean of its divisors is an integer number (5155910779).

Almost surely, 2^10311821557 is an apocalyptic number.

It is an amenable number.

10311821557 is a deficient number, since it is larger than the sum of its proper divisors (1).

10311821557 is an equidigital number, since it uses as much as digits as its factorization.

10311821557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 34.

The spelling of 10311821557 in words is "ten billion, three hundred eleven million, eight hundred twenty-one thousand, five hundred fifty-seven".