654931961 has 4 divisors (see below), whose sum is σ = 655001424. Its totient is φ = 654862500.

The previous prime is 654931951. The next prime is 654931967. The reversal of 654931961 is 169139456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 654931961 - 2⁶ = 654931897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654931967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17855 + ... + 40356.

It is an arithmetic number, because the mean of its divisors is an integer number (163750356).

Almost surely, 2^654931961 is an apocalyptic number.

It is an amenable number.

654931961 is a deficient number, since it is larger than the sum of its proper divisors (69463).

654931961 is a wasteful number, since it uses less digits than its factorization.

654931961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69462.

The product of its digits is 174960, while the sum is 44.

The square root of 654931961 is about 25591.6384977594. The cubic root of 654931961 is about 868.4244886046.

The spelling of 654931961 in words is "six hundred fifty-four million, nine hundred thirty-one thousand, nine hundred sixty-one".