402604209121 has 3 divisors (see below), whose sum is σ = 402604843633. Its totient is φ = 402603574610.

The previous prime is 402604209079. The next prime is 402604209179. The reversal of 402604209121 is 121902406204.

The square root of 402604209121 is 634511.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 402604209121 - 2¹⁷ = 402604078049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402604209181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 317256 + ... + 951766.

Almost surely, 2^402604209121 is an apocalyptic number.

402604209121 is the 634511-st square number.

402604209121 is the 317256-th centered octagonal number.

It is an amenable number.

402604209121 is a deficient number, since it is larger than the sum of its proper divisors (634512).

402604209121 is an frugal number, since it uses more digits than its factorization.

402604209121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269022 (or 634511 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 402604209121 in words is "four hundred two billion, six hundred four million, two hundred nine thousand, one hundred twenty-one".