977894771 has 4 divisors (see below), whose sum is σ = 1117594032. Its totient is φ = 838195512.

The previous prime is 977894741. The next prime is 977894779. The reversal of 977894771 is 177498779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177498779 = 19 ⋅9342041.

It is not a de Polignac number, because 977894771 - 2¹⁴ = 977878387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 977894771.

It is not an unprimeable number, because it can be changed into a prime (977894779) 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, 69849620 + ... + 69849633.

It is an arithmetic number, because the mean of its divisors is an integer number (279398508).

Almost surely, 2^977894771 is an apocalyptic number.

977894771 is a deficient number, since it is larger than the sum of its proper divisors (139699261).

977894771 is a wasteful number, since it uses less digits than its factorization.

977894771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139699260.

The product of its digits is 6223392, while the sum is 59.

The square root of 977894771 is about 31271.3090707760. The cubic root of 977894771 is about 992.5766201235.

The spelling of 977894771 in words is "nine hundred seventy-seven million, eight hundred ninety-four thousand, seven hundred seventy-one".