997615877 has 4 divisors (see below), whose sum is σ = 997690860. Its totient is φ = 997540896.

The previous prime is 997615859. The next prime is 997615901. The reversal of 997615877 is 778516799.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 87628321 + 909987556 = 9361^2 + 30166^2 .

It is a cyclic number.

It is not a de Polignac number, because 997615877 - 2¹⁰ = 997614853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997615847) 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, 11552 + ... + 46137.

It is an arithmetic number, because the mean of its divisors is an integer number (249422715).

Almost surely, 2^997615877 is an apocalyptic number.

It is an amenable number.

997615877 is a deficient number, since it is larger than the sum of its proper divisors (74983).

997615877 is a wasteful number, since it uses less digits than its factorization.

997615877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74982.

The product of its digits is 6667920, while the sum is 59.

The square root of 997615877 is about 31585.0578121997. The cubic root of 997615877 is about 999.2046599352.

The spelling of 997615877 in words is "nine hundred ninety-seven million, six hundred fifteen thousand, eight hundred seventy-seven".