891571490 has 16 divisors (see below), whose sum is σ = 1606061952. Its totient is φ = 356354544.

The previous prime is 891571489. The next prime is 891571493. The reversal of 891571490 is 94175198.

It is not an unprimeable number, because it can be changed into a prime (891571493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20324 + ... + 46863.

It is an arithmetic number, because the mean of its divisors is an integer number (100378872).

Almost surely, 2^891571490 is an apocalyptic number.

891571490 is a deficient number, since it is larger than the sum of its proper divisors (714490462).

891571490 is a wasteful number, since it uses less digits than its factorization.

891571490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68521.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 891571490 is about 29859.1943963664. The cubic root of 891571490 is about 962.4659872166.

The spelling of 891571490 in words is "eight hundred ninety-one million, five hundred seventy-one thousand, four hundred ninety".