620831 has 2 divisors, whose sum is σ = 620832. Its totient is φ = 620830.

The previous prime is 620827. The next prime is 620849. The reversal of 620831 is 138026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620831 - 2² = 620827 is a prime.

It is a super-2 number, since 2×620831² = 770862261122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310415 + 310416.

It is an arithmetic number, because the mean of its divisors is an integer number (310416).

2⁶²⁰⁸³¹ is an apocalyptic number.

620831 is a deficient number, since it is larger than the sum of its proper divisors (1).

620831 is an equidigital number, since it uses as much as digits as its factorization.

620831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 620831 is about 787.9282962301. The cubic root of 620831 is about 85.3082693452.

Adding to 620831 its reverse (138026), we get a palindrome (758857).

The spelling of 620831 in words is "six hundred twenty thousand, eight hundred thirty-one".