977970817 has 4 divisors (see below), whose sum is σ = 986625540. Its totient is φ = 969316096.

The previous prime is 977970811. The next prime is 977970821. The reversal of 977970817 is 718079779.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31854736 + 946116081 = 5644^2 + 30759^2 .

It is a cyclic number.

It is not a de Polignac number, because 977970817 - 2¹⁹ = 977446529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977970811) 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 3 ways as a sum of consecutive naturals, for example, 4327192 + ... + 4327417.

It is an arithmetic number, because the mean of its divisors is an integer number (246656385).

Almost surely, 2^977970817 is an apocalyptic number.

It is an amenable number.

977970817 is a deficient number, since it is larger than the sum of its proper divisors (8654723).

977970817 is a wasteful number, since it uses less digits than its factorization.

977970817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8654722.

The product of its (nonzero) digits is 1555848, while the sum is 55.

The square root of 977970817 is about 31272.5249540231. The cubic root of 977970817 is about 992.6023487014.

The spelling of 977970817 in words is "nine hundred seventy-seven million, nine hundred seventy thousand, eight hundred seventeen".