977901961 has 8 divisors (see below), whose sum is σ = 981841664. Its totient is φ = 973969920.

The previous prime is 977901959. The next prime is 977901973. The reversal of 977901961 is 169109779.

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 not a de Polignac number, because 977901961 - 2¹ = 977901959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977901361) 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, 421996 + ... + 424306.

It is an arithmetic number, because the mean of its divisors is an integer number (122730208).

Almost surely, 2^977901961 is an apocalyptic number.

It is an amenable number.

977901961 is a deficient number, since it is larger than the sum of its proper divisors (3939703).

977901961 is a wasteful number, since it uses less digits than its factorization.

977901961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831.

The product of its (nonzero) digits is 214326, while the sum is 49.

The square root of 977901961 is about 31271.4240321735. The cubic root of 977901961 is about 992.5790527672.

The spelling of 977901961 in words is "nine hundred seventy-seven million, nine hundred one thousand, nine hundred sixty-one".