891125999 has 2 divisors, whose sum is σ = 891126000. Its totient is φ = 891125998.

The previous prime is 891125987. The next prime is 891126037. The reversal of 891125999 is 999521198.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891125999 - 2⁸ = 891125743 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891125999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891125909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445562999 + 445563000.

It is an arithmetic number, because the mean of its divisors is an integer number (445563000).

Almost surely, 2^891125999 is an apocalyptic number.

891125999 is a deficient number, since it is larger than the sum of its proper divisors (1).

891125999 is an equidigital number, since it uses as much as digits as its factorization.

891125999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 53.

The square root of 891125999 is about 29851.7336012500. The cubic root of 891125999 is about 962.3056555722.

The spelling of 891125999 in words is "eight hundred ninety-one million, one hundred twenty-five thousand, nine hundred ninety-nine".