620501551 has 2 divisors, whose sum is σ = 620501552. Its totient is φ = 620501550.

The previous prime is 620501491. The next prime is 620501579. The reversal of 620501551 is 155105026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620501551 - 2⁹ = 620501039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620501591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310250775 + 310250776.

It is an arithmetic number, because the mean of its divisors is an integer number (310250776).

Almost surely, 2^620501551 is an apocalyptic number.

620501551 is a deficient number, since it is larger than the sum of its proper divisors (1).

620501551 is an equidigital number, since it uses as much as digits as its factorization.

620501551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 620501551 is about 24909.8685464215. The cubic root of 620501551 is about 852.9317683384.

Adding to 620501551 its reverse (155105026), we get a palindrome (775606577).

The spelling of 620501551 in words is "six hundred twenty million, five hundred one thousand, five hundred fifty-one".