977520881 has 4 divisors (see below), whose sum is σ = 990911652. Its totient is φ = 964130112.

The previous prime is 977520857. The next prime is 977520889. The reversal of 977520881 is 188025779.

977520881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188025779 = 103 ⋅1825493.

It can be written as a sum of positive squares in 2 ways, for example, as 384160000 + 593360881 = 19600^2 + 24359^2 .

It is a cyclic number.

It is not a de Polignac number, because 977520881 - 2¹⁴ = 977504497 is a prime.

It is a super-2 number, since 2×977520881² = 1911094145582032322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (977520889) 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, 6695276 + ... + 6695421.

It is an arithmetic number, because the mean of its divisors is an integer number (247727913).

Almost surely, 2^977520881 is an apocalyptic number.

It is an amenable number.

977520881 is a deficient number, since it is larger than the sum of its proper divisors (13390771).

977520881 is a wasteful number, since it uses less digits than its factorization.

977520881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13390770.

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 977520881 is about 31265.3303356929. The cubic root of 977520881 is about 992.4501028366.

The spelling of 977520881 in words is "nine hundred seventy-seven million, five hundred twenty thousand, eight hundred eighty-one".