620421253 has 4 divisors (see below), whose sum is σ = 620566380. Its totient is φ = 620276128.

The previous prime is 620421223. The next prime is 620421257. The reversal of 620421253 is 352124026.

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 348270244 + 272151009 = 18662^2 + 16497^2 .

It is a cyclic number.

It is not a de Polignac number, because 620421253 - 2²¹ = 618324101 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 (620421257) 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, 65950 + ... + 74767.

It is an arithmetic number, because the mean of its divisors is an integer number (155141595).

Almost surely, 2^620421253 is an apocalyptic number.

It is an amenable number.

620421253 is a deficient number, since it is larger than the sum of its proper divisors (145127).

620421253 is a wasteful number, since it uses less digits than its factorization.

620421253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145126.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 620421253 is about 24908.2567234241. The cubic root of 620421253 is about 852.8949746244.

Adding to 620421253 its reverse (352124026), we get a palindrome (972545279).

The spelling of 620421253 in words is "six hundred twenty million, four hundred twenty-one thousand, two hundred fifty-three".