977551681 has 8 divisors (see below), whose sum is σ = 1021489920. Its totient is φ = 933733152.

The previous prime is 977551667. The next prime is 977551693. The reversal of 977551681 is 186155779.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-977551681 is a prime.

It is a super-2 number, since 2×977551681² = 1911214578051851522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977551661) 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, 13020 + ... + 46093.

It is an arithmetic number, because the mean of its divisors is an integer number (127686240).

Almost surely, 2^977551681 is an apocalyptic number.

It is an amenable number.

977551681 is a deficient number, since it is larger than the sum of its proper divisors (43938239).

977551681 is a wasteful number, since it uses less digits than its factorization.

977551681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59855.

The product of its digits is 529200, while the sum is 49.

The square root of 977551681 is about 31265.8228901783. The cubic root of 977551681 is about 992.4605261918.

The spelling of 977551681 in words is "nine hundred seventy-seven million, five hundred fifty-one thousand, six hundred eighty-one".