891129560 has 16 divisors (see below), whose sum is σ = 2005041600. Its totient is φ = 356451808.

The previous prime is 891129557. The next prime is 891129563. The reversal of 891129560 is 65921198.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (891129557) and next prime (891129563).

It is a super-2 number, since 2×891129560² = 1588223785411587200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891129563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11139080 + ... + 11139159.

It is an arithmetic number, because the mean of its divisors is an integer number (125315100).

Almost surely, 2^891129560 is an apocalyptic number.

It is an amenable number.

891129560 is an abundant number, since it is smaller than the sum of its proper divisors (1113912040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

891129560 is a wasteful number, since it uses less digits than its factorization.

891129560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22278250 (or 22278246 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 891129560 is about 29851.7932459677. The cubic root of 891129560 is about 962.3069373834.

The spelling of 891129560 in words is "eight hundred ninety-one million, one hundred twenty-nine thousand, five hundred sixty".