2604035981 has 4 divisors (see below), whose sum is σ = 2604144000. Its totient is φ = 2603927964.

The previous prime is 2604035971. The next prime is 2604036041. The reversal of 2604035981 is 1895304062.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2604035981 - 2¹⁰ = 2604034957 is a prime.

It is a super-2 number, since 2×2604035981² = 13562006780685264722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2604035971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470 + ... + 72168.

It is an arithmetic number, because the mean of its divisors is an integer number (651036000).

Almost surely, 2^2604035981 is an apocalyptic number.

It is an amenable number.

2604035981 is a deficient number, since it is larger than the sum of its proper divisors (108019).

2604035981 is an equidigital number, since it uses as much as digits as its factorization.

2604035981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108018.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 2604035981 is about 51029.7558391180. The cubic root of 2604035981 is about 1375.7800058777.

The spelling of 2604035981 in words is "two billion, six hundred four million, thirty-five thousand, nine hundred eighty-one".