698766121 has 2 divisors, whose sum is σ = 698766122. Its totient is φ = 698766120.

The previous prime is 698766007. The next prime is 698766137. The reversal of 698766121 is 121667896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695060496 + 3705625 = 26364^2 + 1925^2 .

It is a cyclic number.

It is not a de Polignac number, because 698766121 - 2²⁵ = 665211689 is a prime.

It is not a weakly prime, because it can be changed into another prime (698766161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349383060 + 349383061.

It is an arithmetic number, because the mean of its divisors is an integer number (349383061).

Almost surely, 2^698766121 is an apocalyptic number.

It is an amenable number.

698766121 is a deficient number, since it is larger than the sum of its proper divisors (1).

698766121 is an equidigital number, since it uses as much as digits as its factorization.

698766121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 698766121 is about 26434.1847046585. The cubic root of 698766121 is about 887.3819967687.

The spelling of 698766121 in words is "six hundred ninety-eight million, seven hundred sixty-six thousand, one hundred twenty-one".