311201109689 has 2 divisors, whose sum is σ = 311201109690. Its totient is φ = 311201109688.

The previous prime is 311201109677. The next prime is 311201109697. The reversal of 311201109689 is 986901102113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307780848400 + 3420261289 = 554780^2 + 58483^2 .

It is a cyclic number.

It is not a de Polignac number, because 311201109689 - 2⁸ = 311201109433 is a prime.

It is a super-2 number, since 2×311201109689² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311201109629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155600554844 + 155600554845.

It is an arithmetic number, because the mean of its divisors is an integer number (155600554845).

Almost surely, 2^311201109689 is an apocalyptic number.

It is an amenable number.

311201109689 is a deficient number, since it is larger than the sum of its proper divisors (1).

311201109689 is an equidigital number, since it uses as much as digits as its factorization.

311201109689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 311201109689 in words is "three hundred eleven billion, two hundred one million, one hundred nine thousand, six hundred eighty-nine".