312021121189 has 2 divisors, whose sum is σ = 312021121190. Its totient is φ = 312021121188.

The previous prime is 312021121157. The next prime is 312021121231. The reversal of 312021121189 is 981121120213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290772228289 + 21248892900 = 539233^2 + 145770^2 .

It is a cyclic number.

It is not a de Polignac number, because 312021121189 - 2⁵ = 312021121157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312021121189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312021121129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156010560594 + 156010560595.

It is an arithmetic number, because the mean of its divisors is an integer number (156010560595).

Almost surely, 2^312021121189 is an apocalyptic number.

It is an amenable number.

312021121189 is a deficient number, since it is larger than the sum of its proper divisors (1).

312021121189 is an equidigital number, since it uses as much as digits as its factorization.

312021121189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 312021121189 in words is "three hundred twelve billion, twenty-one million, one hundred twenty-one thousand, one hundred eighty-nine".