604998991 has 4 divisors (see below), whose sum is σ = 611236192. Its totient is φ = 598761792.

The previous prime is 604998973. The next prime is 604998997. The reversal of 604998991 is 199899406.

604998991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 604998991 - 2²⁷ = 470781263 is a prime.

It is a super-2 number, since 2×604998991² = 732047558222036162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (604998997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3118455 + ... + 3118648.

It is an arithmetic number, because the mean of its divisors is an integer number (152809048).

Almost surely, 2^604998991 is an apocalyptic number.

604998991 is a deficient number, since it is larger than the sum of its proper divisors (6237201).

604998991 is an equidigital number, since it uses as much as digits as its factorization.

604998991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237200.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 604998991 is about 24596.7272416474. The cubic root of 604998991 is about 845.7685856289.

The spelling of 604998991 in words is "six hundred four million, nine hundred ninety-eight thousand, nine hundred ninety-one".