604181021 has 2 divisors, whose sum is σ = 604181022. Its totient is φ = 604181020.

The previous prime is 604180949. The next prime is 604181023. The reversal of 604181021 is 120181406.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544288900 + 59892121 = 23330^2 + 7739^2 .

It is a cyclic number.

It is not a de Polignac number, because 604181021 - 2¹⁴ = 604164637 is a prime.

It is a super-2 number, since 2×604181021² = 730069412273204882, which contains 22 as substring.

Together with 604181023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (604181023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302090510 + 302090511.

It is an arithmetic number, because the mean of its divisors is an integer number (302090511).

Almost surely, 2^604181021 is an apocalyptic number.

It is an amenable number.

604181021 is a deficient number, since it is larger than the sum of its proper divisors (1).

604181021 is an equidigital number, since it uses as much as digits as its factorization.

604181021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 604181021 is about 24580.0939990066. The cubic root of 604181021 is about 845.3872487141.

The spelling of 604181021 in words is "six hundred four million, one hundred eighty-one thousand, twenty-one".