621470653 has 4 divisors (see below), whose sum is σ = 622440828. Its totient is φ = 620500480.

The previous prime is 621470621. The next prime is 621470657. The reversal of 621470653 is 356074126.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 356529924 + 264940729 = 18882^2 + 16277^2 .

It is a cyclic number.

It is not a de Polignac number, because 621470653 - 2⁵ = 621470621 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 (621470657) 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, 484126 + ... + 485407.

It is an arithmetic number, because the mean of its divisors is an integer number (155610207).

Almost surely, 2^621470653 is an apocalyptic number.

It is an amenable number.

621470653 is a deficient number, since it is larger than the sum of its proper divisors (970175).

621470653 is an equidigital number, since it uses as much as digits as its factorization.

621470653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970174.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 621470653 is about 24929.3131273206. The cubic root of 621470653 is about 853.3755748777.

It can be divided in two parts, 6214 and 70653, that added together give a palindrome (76867).

The spelling of 621470653 in words is "six hundred twenty-one million, four hundred seventy thousand, six hundred fifty-three".