312450172121 has 2 divisors, whose sum is σ = 312450172122. Its totient is φ = 312450172120.

The previous prime is 312450172103. The next prime is 312450172193. The reversal of 312450172121 is 121271054213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310065217225 + 2384954896 = 556835^2 + 48836^2 .

It is a cyclic number.

It is not a de Polignac number, because 312450172121 - 2¹⁰ = 312450171097 is a prime.

It is a super-2 number, since 2×312450172121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312450172421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156225086060 + 156225086061.

It is an arithmetic number, because the mean of its divisors is an integer number (156225086061).

Almost surely, 2^312450172121 is an apocalyptic number.

It is an amenable number.

312450172121 is a deficient number, since it is larger than the sum of its proper divisors (1).

312450172121 is an equidigital number, since it uses as much as digits as its factorization.

312450172121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 312450172121 in words is "three hundred twelve billion, four hundred fifty million, one hundred seventy-two thousand, one hundred twenty-one".