565641551 has 4 divisors (see below), whose sum is σ = 568133592. Its totient is φ = 563149512.

The previous prime is 565641541. The next prime is 565641619. The reversal of 565641551 is 155146565.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 565641551 - 2⁶ = 565641487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565641521) 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, 1245680 + ... + 1246133.

It is an arithmetic number, because the mean of its divisors is an integer number (142033398).

Almost surely, 2^565641551 is an apocalyptic number.

565641551 is a deficient number, since it is larger than the sum of its proper divisors (2492041).

565641551 is a wasteful number, since it uses less digits than its factorization.

565641551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492040.

The product of its digits is 90000, while the sum is 38.

The square root of 565641551 is about 23783.2199460039. The cubic root of 565641551 is about 827.0157264796.

The spelling of 565641551 in words is "five hundred sixty-five million, six hundred forty-one thousand, five hundred fifty-one".