591919961 has 2 divisors, whose sum is σ = 591919962. Its totient is φ = 591919960.

The previous prime is 591919907. The next prime is 591919981. The reversal of 591919961 is 169919195.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472236361 + 119683600 = 21731^2 + 10940^2 .

It is a cyclic number.

It is not a de Polignac number, because 591919961 - 2²² = 587725657 is a prime.

It is not a weakly prime, because it can be changed into another prime (591919981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295959980 + 295959981.

It is an arithmetic number, because the mean of its divisors is an integer number (295959981).

Almost surely, 2^591919961 is an apocalyptic number.

It is an amenable number.

591919961 is a deficient number, since it is larger than the sum of its proper divisors (1).

591919961 is an equidigital number, since it uses as much as digits as its factorization.

591919961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196830, while the sum is 50.

The square root of 591919961 is about 24329.4052742766. The cubic root of 591919961 is about 839.6294477666.

The spelling of 591919961 in words is "five hundred ninety-one million, nine hundred nineteen thousand, nine hundred sixty-one".