620501491 has 2 divisors, whose sum is σ = 620501492. Its totient is φ = 620501490.

The previous prime is 620501459. The next prime is 620501551. The reversal of 620501491 is 194105026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620501491 - 2⁵ = 620501459 is a prime.

It is not a weakly prime, because it can be changed into another prime (620501591) 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, 310250745 + 310250746.

It is an arithmetic number, because the mean of its divisors is an integer number (310250746).

Almost surely, 2^620501491 is an apocalyptic number.

620501491 is a deficient number, since it is larger than the sum of its proper divisors (1).

620501491 is an equidigital number, since it uses as much as digits as its factorization.

620501491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 620501491 is about 24909.8673420795. The cubic root of 620501491 is about 852.9317408467.

The spelling of 620501491 in words is "six hundred twenty million, five hundred one thousand, four hundred ninety-one".