891061977 has 8 divisors (see below), whose sum is σ = 1279473664. Its totient is φ = 548345808.

The previous prime is 891061967. The next prime is 891061993. The reversal of 891061977 is 779160198.

It is a happy number.

891061977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 891061977 - 2⁷ = 891061849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891061937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11423833 + ... + 11423910.

It is an arithmetic number, because the mean of its divisors is an integer number (159934208).

Almost surely, 2^891061977 is an apocalyptic number.

It is an amenable number.

891061977 is a deficient number, since it is larger than the sum of its proper divisors (388411687).

891061977 is a wasteful number, since it uses less digits than its factorization.

891061977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22847759.

The product of its (nonzero) digits is 190512, while the sum is 48.

The square root of 891061977 is about 29850.6612489573. The cubic root of 891061977 is about 962.2826097447.

The spelling of 891061977 in words is "eight hundred ninety-one million, sixty-one thousand, nine hundred seventy-seven".