891985461 has 32 divisors (see below), whose sum is σ = 1275264000. Its totient is φ = 552625920.

The previous prime is 891985447. The next prime is 891985469. The reversal of 891985461 is 164589198.

It is not a de Polignac number, because 891985461 - 2⁵ = 891985429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891985469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1816426 + ... + 1816916.

It is an arithmetic number, because the mean of its divisors is an integer number (39852000).

Almost surely, 2^891985461 is an apocalyptic number.

It is an amenable number.

891985461 is a deficient number, since it is larger than the sum of its proper divisors (383278539).

891985461 is a wasteful number, since it uses less digits than its factorization.

891985461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889.

The product of its digits is 622080, while the sum is 51.

The square root of 891985461 is about 29866.1256442813. The cubic root of 891985461 is about 962.6149269861.

The spelling of 891985461 in words is "eight hundred ninety-one million, nine hundred eighty-five thousand, four hundred sixty-one".