620434631 has 2 divisors, whose sum is σ = 620434632. Its totient is φ = 620434630.

The previous prime is 620434609. The next prime is 620434657. The reversal of 620434631 is 136434026.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620434631 is a prime.

It is a super-2 number, since 2×620434631² = 769878262688212322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 620434594 and 620434603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620430631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310217315 + 310217316.

It is an arithmetic number, because the mean of its divisors is an integer number (310217316).

Almost surely, 2^620434631 is an apocalyptic number.

620434631 is a deficient number, since it is larger than the sum of its proper divisors (1).

620434631 is an equidigital number, since it uses as much as digits as its factorization.

620434631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 620434631 is about 24908.5252674662. The cubic root of 620434631 is about 852.9011048394.

Adding to 620434631 its reverse (136434026), we get a palindrome (756868657).

The spelling of 620434631 in words is "six hundred twenty million, four hundred thirty-four thousand, six hundred thirty-one".