565147991 has 2 divisors, whose sum is σ = 565147992. Its totient is φ = 565147990.

The previous prime is 565147987. The next prime is 565147993. The reversal of 565147991 is 199741565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 565147991 - 2² = 565147987 is a prime.

Together with 565147993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (565147993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282573995 + 282573996.

It is an arithmetic number, because the mean of its divisors is an integer number (282573996).

Almost surely, 2^565147991 is an apocalyptic number.

565147991 is a deficient number, since it is larger than the sum of its proper divisors (1).

565147991 is an equidigital number, since it uses as much as digits as its factorization.

565147991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 47.

The square root of 565147991 is about 23772.8414582691. The cubic root of 565147991 is about 826.7751143459.

The spelling of 565147991 in words is "five hundred sixty-five million, one hundred forty-seven thousand, nine hundred ninety-one".