565426621 has 4 divisors (see below), whose sum is σ = 572584000. Its totient is φ = 558269244.

The previous prime is 565426619. The next prime is 565426663. The reversal of 565426621 is 126624565.

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 an emirpimes, since its reverse is a distinct semiprime: 126624565 = 5 ⋅25324913.

It is a cyclic number.

It is not a de Polignac number, because 565426621 - 2¹ = 565426619 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 (565420621) 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, 3578571 + ... + 3578728.

It is an arithmetic number, because the mean of its divisors is an integer number (143146000).

Almost surely, 2^565426621 is an apocalyptic number.

It is an amenable number.

565426621 is a deficient number, since it is larger than the sum of its proper divisors (7157379).

565426621 is an equidigital number, since it uses as much as digits as its factorization.

565426621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7157378.

The product of its digits is 86400, while the sum is 37.

The square root of 565426621 is about 23778.7009947978. The cubic root of 565426621 is about 826.9109646045.

The spelling of 565426621 in words is "five hundred sixty-five million, four hundred twenty-six thousand, six hundred twenty-one".