654977961 has 24 divisors (see below), whose sum is σ = 1066574880. Its totient is φ = 396954360.

The previous prime is 654977879. The next prime is 654977977. The reversal of 654977961 is 169779456.

654977961 is a `hidden beast` number, since 6 + 549 + 7 + 7 + 96 + 1 = 666.

It is not a de Polignac number, because 654977961 - 2¹⁹ = 654453673 is a prime.

It is a super-2 number, since 2×654977961² = 857992258791435042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 654977898 and 654977907.

It is not an unprimeable number, because it can be changed into a prime (654977261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96975 + ... + 103508.

It is an arithmetic number, because the mean of its divisors is an integer number (44440620).

Almost surely, 2^654977961 is an apocalyptic number.

It is an amenable number.

654977961 is a deficient number, since it is larger than the sum of its proper divisors (411596919).

654977961 is a wasteful number, since it uses less digits than its factorization.

654977961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200514 (or 200497 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 654977961 is about 25592.5372130236. The cubic root of 654977961 is about 868.4448197706. Note that the first 3 decimals are identical.

The spelling of 654977961 in words is "six hundred fifty-four million, nine hundred seventy-seven thousand, nine hundred sixty-one".