311121001969 has 2 divisors, whose sum is σ = 311121001970. Its totient is φ = 311121001968.

The previous prime is 311121001967. The next prime is 311121001979. The reversal of 311121001969 is 969100121113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176954835600 + 134166166369 = 420660^2 + 366287^2 .

It is an emirp because it is prime and its reverse (969100121113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311121001969 - 2¹ = 311121001967 is a prime.

It is a super-2 number, since 2×311121001969² (a number of 24 digits) contains 22 as substring.

Together with 311121001967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (311121001967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560500984 + 155560500985.

It is an arithmetic number, because the mean of its divisors is an integer number (155560500985).

Almost surely, 2^311121001969 is an apocalyptic number.

It is an amenable number.

311121001969 is a deficient number, since it is larger than the sum of its proper divisors (1).

311121001969 is an equidigital number, since it uses as much as digits as its factorization.

311121001969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 311121001969 in words is "three hundred eleven billion, one hundred twenty-one million, one thousand, nine hundred sixty-nine".