620431553 has 16 divisors (see below), whose sum is σ = 716325120. Its totient is φ = 526382016.

The previous prime is 620431543. The next prime is 620431573. The reversal of 620431553 is 355134026.

It is a cyclic number.

It is not a de Polignac number, because 620431553 - 2²⁰ = 619382977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620431543) 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 15 ways as a sum of consecutive naturals, for example, 313475 + ... + 315447.

It is an arithmetic number, because the mean of its divisors is an integer number (44770320).

Almost surely, 2^620431553 is an apocalyptic number.

It is an amenable number.

620431553 is a deficient number, since it is larger than the sum of its proper divisors (95893567).

620431553 is a wasteful number, since it uses less digits than its factorization.

620431553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 620431553 is about 24908.4634813149. The cubic root of 620431553 is about 852.8996944120.

Adding to 620431553 its reverse (355134026), we get a palindrome (975565579).

The spelling of 620431553 in words is "six hundred twenty million, four hundred thirty-one thousand, five hundred fifty-three".