620630291 has 2 divisors, whose sum is σ = 620630292. Its totient is φ = 620630290.

The previous prime is 620630251. The next prime is 620630299. The reversal of 620630291 is 192036026.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620630291 is a prime.

It is not a weakly prime, because it can be changed into another prime (620630299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310315145 + 310315146.

It is an arithmetic number, because the mean of its divisors is an integer number (310315146).

Almost surely, 2^620630291 is an apocalyptic number.

620630291 is a deficient number, since it is larger than the sum of its proper divisors (1).

620630291 is an equidigital number, since it uses as much as digits as its factorization.

620630291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 620630291 is about 24912.4525288057. The cubic root of 620630291 is about 852.9907522590.

The spelling of 620630291 in words is "six hundred twenty million, six hundred thirty thousand, two hundred ninety-one".