620345651 has 2 divisors, whose sum is σ = 620345652. Its totient is φ = 620345650.

The previous prime is 620345639. The next prime is 620345659. The reversal of 620345651 is 156543026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620345651 - 2²⁶ = 553236787 is a prime.

It is a super-2 number, since 2×620345651² = 769657453429227602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (620345659) 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, 310172825 + 310172826.

It is an arithmetic number, because the mean of its divisors is an integer number (310172826).

Almost surely, 2^620345651 is an apocalyptic number.

620345651 is a deficient number, since it is larger than the sum of its proper divisors (1).

620345651 is an equidigital number, since it uses as much as digits as its factorization.

620345651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 620345651 is about 24906.7390679711. The cubic root of 620345651 is about 852.8603297844.

Adding to 620345651 its reverse (156543026), we get a palindrome (776888677).

The spelling of 620345651 in words is "six hundred twenty million, three hundred forty-five thousand, six hundred fifty-one".