420562591 has 4 divisors (see below), whose sum is σ = 421331992. Its totient is φ = 419793192.

The previous prime is 420562559. The next prime is 420562603. The reversal of 420562591 is 195265024.

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 420562591 - 2⁵ = 420562559 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 (420562391) 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, 383880 + ... + 384973.

It is an arithmetic number, because the mean of its divisors is an integer number (105332998).

Almost surely, 2^420562591 is an apocalyptic number.

420562591 is a deficient number, since it is larger than the sum of its proper divisors (769401).

420562591 is an equidigital number, since it uses as much as digits as its factorization.

420562591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769400.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 420562591 is about 20507.6227535031. The cubic root of 420562591 is about 749.2214682789.

The spelling of 420562591 in words is "four hundred twenty million, five hundred sixty-two thousand, five hundred ninety-one".