891380913 has 16 divisors (see below), whose sum is σ = 1228234752. Its totient is φ = 574434000.

The previous prime is 891380891. The next prime is 891380921. The reversal of 891380913 is 319083198.

It is a happy number.

It is not a de Polignac number, because 891380913 - 2⁹ = 891380401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891380923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85368 + ... + 95238.

It is an arithmetic number, because the mean of its divisors is an integer number (76764672).

Almost surely, 2^891380913 is an apocalyptic number.

It is an amenable number.

891380913 is a deficient number, since it is larger than the sum of its proper divisors (336853839).

891380913 is a wasteful number, since it uses less digits than its factorization.

891380913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10876.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 891380913 is about 29856.0029642281. The cubic root of 891380913 is about 962.3974053349.

The spelling of 891380913 in words is "eight hundred ninety-one million, three hundred eighty thousand, nine hundred thirteen".