891427725 has 54 divisors (see below), whose sum is σ = 1696214910. Its totient is φ = 447429120.

The previous prime is 891427703. The next prime is 891427729. The reversal of 891427725 is 527724198.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 1121481 + 890306244 = 1059^2 + 29838^2 .

It is not a de Polignac number, because 891427725 - 2⁷ = 891427597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891427729) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 58171 + ... + 71879.

Almost surely, 2^891427725 is an apocalyptic number.

891427725 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

891427725 is a deficient number, since it is larger than the sum of its proper divisors (804787185).

891427725 is a wasteful number, since it uses less digits than its factorization.

891427725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13759 (or 13734 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 891427725 is about 29856.7869168804. The cubic root of 891427725 is about 962.4142522138.

The spelling of 891427725 in words is "eight hundred ninety-one million, four hundred twenty-seven thousand, seven hundred twenty-five".