978317881 has 4 divisors (see below), whose sum is σ = 994899600. Its totient is φ = 961736164.

The previous prime is 978317869. The next prime is 978317911. The reversal of 978317881 is 188713879.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 978317881 - 2⁹ = 978317369 is a prime.

It is a super-2 number, since 2×978317881² = 1914211752568660322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978317801) 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, 8290771 + ... + 8290888.

It is an arithmetic number, because the mean of its divisors is an integer number (248724900).

Almost surely, 2^978317881 is an apocalyptic number.

It is an amenable number.

978317881 is a deficient number, since it is larger than the sum of its proper divisors (16581719).

978317881 is a wasteful number, since it uses less digits than its factorization.

978317881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16581718.

The product of its digits is 677376, while the sum is 52.

The square root of 978317881 is about 31278.0734860701. The cubic root of 978317881 is about 992.7197536354.

The spelling of 978317881 in words is "nine hundred seventy-eight million, three hundred seventeen thousand, eight hundred eighty-one".