904678991 has 2 divisors, whose sum is σ = 904678992. Its totient is φ = 904678990.

The previous prime is 904678969. The next prime is 904679047. The reversal of 904678991 is 199876409.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 904678991 - 2¹⁴ = 904662607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (904678391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452339495 + 452339496.

It is an arithmetic number, because the mean of its divisors is an integer number (452339496).

Almost surely, 2^904678991 is an apocalyptic number.

904678991 is a deficient number, since it is larger than the sum of its proper divisors (1).

904678991 is an equidigital number, since it uses as much as digits as its factorization.

904678991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 904678991 is about 30077.8820896685. The cubic root of 904678991 is about 967.1596475691.

The spelling of 904678991 in words is "nine hundred four million, six hundred seventy-eight thousand, nine hundred ninety-one".