621153253 has 6 divisors (see below), whose sum is σ = 722566086. Its totient is φ = 532417032.

The previous prime is 621153241. The next prime is 621153257. The reversal of 621153253 is 352351126.

It can be written as a sum of positive squares in only one way, i.e., 395492769 + 225660484 = 19887^2 + 15022^2 .

It is a de Polignac number, because none of the positive numbers 2^k-621153253 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 (621153257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6338250 + ... + 6338347.

It is an arithmetic number, because the mean of its divisors is an integer number (120427681).

Almost surely, 2^621153253 is an apocalyptic number.

It is an amenable number.

621153253 is a deficient number, since it is larger than the sum of its proper divisors (101412833).

621153253 is a wasteful number, since it uses less digits than its factorization.

621153253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12676611 (or 12676604 counting only the distinct ones).

The product of its digits is 5400, while the sum is 28.

The square root of 621153253 is about 24922.9463145913. The cubic root of 621153253 is about 853.2302703321.

The spelling of 621153253 in words is "six hundred twenty-one million, one hundred fifty-three thousand, two hundred fifty-three".