311221210201961 has 2 divisors, whose sum is σ = 311221210201962. Its totient is φ = 311221210201960.

The previous prime is 311221210201949. The next prime is 311221210202027. The reversal of 311221210201961 is 169102012122113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310755867936361 + 465342265600 = 17628269^2 + 682160^2 .

It is a cyclic number.

It is not a de Polignac number, because 311221210201961 - 2³⁴ = 311204030332777 is a prime.

It is a super-3 number, since 3×311221210201961³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (311221210201861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610605100980 + 155610605100981.

It is an arithmetic number, because the mean of its divisors is an integer number (155610605100981).

Almost surely, 2^{311221210201961} is an apocalyptic number.

It is an amenable number.

311221210201961 is a deficient number, since it is larger than the sum of its proper divisors (1).

311221210201961 is an equidigital number, since it uses as much as digits as its factorization.

311221210201961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 311221210201961 in words is "three hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, two hundred one thousand, nine hundred sixty-one".