620633231 has 2 divisors, whose sum is σ = 620633232. Its totient is φ = 620633230.

The previous prime is 620633191. The next prime is 620633267. The reversal of 620633231 is 132336026.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620633231 is a prime.

It is a super-2 number, since 2×620633231² = 770371214842998722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 620633231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620633831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310316615 + 310316616.

It is an arithmetic number, because the mean of its divisors is an integer number (310316616).

Almost surely, 2^620633231 is an apocalyptic number.

620633231 is a deficient number, since it is larger than the sum of its proper divisors (1).

620633231 is an equidigital number, since it uses as much as digits as its factorization.

620633231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 620633231 is about 24912.5115353711. The cubic root of 620633231 is about 852.9920991633.

Adding to 620633231 its reverse (132336026), we get a palindrome (752969257).

The spelling of 620633231 in words is "six hundred twenty million, six hundred thirty-three thousand, two hundred thirty-one".