975777961 has 4 divisors (see below), whose sum is σ = 976197124. Its totient is φ = 975358800.

The previous prime is 975777953. The next prime is 975777977. The reversal of 975777961 is 169777579.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255392361 + 720385600 = 15981^2 + 26840^2 .

It is a cyclic number.

It is not a de Polignac number, because 975777961 - 2³ = 975777953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 975777896 and 975777905.

It is not an unprimeable number, because it can be changed into a prime (975777991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206070 + ... + 210751.

It is an arithmetic number, because the mean of its divisors is an integer number (244049281).

Almost surely, 2^975777961 is an apocalyptic number.

It is an amenable number.

975777961 is a deficient number, since it is larger than the sum of its proper divisors (419163).

975777961 is a wasteful number, since it uses less digits than its factorization.

975777961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419162.

The product of its digits is 5834430, while the sum is 58.

The square root of 975777961 is about 31237.4448538929. Note that the first 3 decimals coincide. The cubic root of 975777961 is about 991.8599056547.

The spelling of 975777961 in words is "nine hundred seventy-five million, seven hundred seventy-seven thousand, nine hundred sixty-one".