891473977 has 6 divisors (see below), whose sum is σ = 940863498. Its totient is φ = 844553952.

The previous prime is 891473969. The next prime is 891474019. The reversal of 891473977 is 779374198.

It can be written as a sum of positive squares in only one way, i.e., 683508736 + 207965241 = 26144^2 + 14421^2 .

It is not a de Polignac number, because 891473977 - 2³ = 891473969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891473917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1234368 + ... + 1235089.

It is an arithmetic number, because the mean of its divisors is an integer number (156810583).

Almost surely, 2^891473977 is an apocalyptic number.

It is an amenable number.

891473977 is a deficient number, since it is larger than the sum of its proper divisors (49389521).

891473977 is a wasteful number, since it uses less digits than its factorization.

891473977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469495 (or 2469476 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 55.

The square root of 891473977 is about 29857.5614710914. The cubic root of 891473977 is about 962.4308969785.

The spelling of 891473977 in words is "eight hundred ninety-one million, four hundred seventy-three thousand, nine hundred seventy-seven".