311400621893 has 2 divisors, whose sum is σ = 311400621894. Its totient is φ = 311400621892.

The previous prime is 311400621871. The next prime is 311400621901. The reversal of 311400621893 is 398126004113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179113475524 + 132287146369 = 423218^2 + 363713^2 .

It is an emirp because it is prime and its reverse (398126004113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311400621893 - 2²⁸ = 311132186437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311400621823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155700310946 + 155700310947.

It is an arithmetic number, because the mean of its divisors is an integer number (155700310947).

Almost surely, 2^311400621893 is an apocalyptic number.

It is an amenable number.

311400621893 is a deficient number, since it is larger than the sum of its proper divisors (1).

311400621893 is an equidigital number, since it uses as much as digits as its factorization.

311400621893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 311400621893 in words is "three hundred eleven billion, four hundred million, six hundred twenty-one thousand, eight hundred ninety-three".