977890981 has 8 divisors (see below), whose sum is σ = 983047104. Its totient is φ = 972743520.

The previous prime is 977890973. The next prime is 977890987. The reversal of 977890981 is 189098779.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 977890981 - 2³ = 977890973 is a prime.

It is a super-2 number, since 2×977890981² = 1912541541442284722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977890987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467520 + ... + 469606.

It is an arithmetic number, because the mean of its divisors is an integer number (122880888).

Almost surely, 2^977890981 is an apocalyptic number.

It is an amenable number.

977890981 is a deficient number, since it is larger than the sum of its proper divisors (5156123).

977890981 is a wasteful number, since it uses less digits than its factorization.

977890981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 977890981 is about 31271.2484720390. The cubic root of 977890981 is about 992.5753378212.

The spelling of 977890981 in words is "nine hundred seventy-seven million, eight hundred ninety thousand, nine hundred eighty-one".