398837058121 has 2 divisors, whose sum is σ = 398837058122. Its totient is φ = 398837058120.

The previous prime is 398837058097. The next prime is 398837058127. The reversal of 398837058121 is 121850738893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316028362896 + 82808695225 = 562164^2 + 287765^2 .

It is a cyclic number.

It is not a de Polignac number, because 398837058121 - 2²³ = 398828669513 is a prime.

It is a super-2 number, since 2×398837058121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398837058127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199418529060 + 199418529061.

It is an arithmetic number, because the mean of its divisors is an integer number (199418529061).

Almost surely, 2^398837058121 is an apocalyptic number.

It is an amenable number.

398837058121 is a deficient number, since it is larger than the sum of its proper divisors (1).

398837058121 is an equidigital number, since it uses as much as digits as its factorization.

398837058121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 398837058121 in words is "three hundred ninety-eight billion, eight hundred thirty-seven million, fifty-eight thousand, one hundred twenty-one".