891571552 has 12 divisors (see below), whose sum is σ = 1755281556. Its totient is φ = 445785760.

The previous prime is 891571507. The next prime is 891571553. The reversal of 891571552 is 255175198.

It is a junction number, because it is equal to n+sod(n) for n = 891571499 and 891571508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891571553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930774 + ... + 13930837.

It is an arithmetic number, because the mean of its divisors is an integer number (146273463).

Almost surely, 2^891571552 is an apocalyptic number.

It is an amenable number.

891571552 is a deficient number, since it is larger than the sum of its proper divisors (863710004).

891571552 is a wasteful number, since it uses less digits than its factorization.

891571552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27861621 (or 27861613 counting only the distinct ones).

The product of its digits is 126000, while the sum is 43.

The square root of 891571552 is about 29859.1954345726. The cubic root of 891571552 is about 962.4660095266.

It can be divided in two parts, 89157 and 1552, that added together give a palindrome (90709).

The spelling of 891571552 in words is "eight hundred ninety-one million, five hundred seventy-one thousand, five hundred fifty-two".