900991079 has 2 divisors, whose sum is σ = 900991080. Its totient is φ = 900991078.

The previous prime is 900991073. The next prime is 900991097. The reversal of 900991079 is 970199009.

Together with next prime (900991097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 900991079 - 2²⁰ = 899942503 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 (900991073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450495539 + 450495540.

It is an arithmetic number, because the mean of its divisors is an integer number (450495540).

Almost surely, 2^900991079 is an apocalyptic number.

900991079 is a deficient number, since it is larger than the sum of its proper divisors (1).

900991079 is an equidigital number, since it uses as much as digits as its factorization.

900991079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 900991079 is about 30016.5134384392. The cubic root of 900991079 is about 965.8436532099.

The spelling of 900991079 in words is "nine hundred million, nine hundred ninety-one thousand, seventy-nine".