620731 has 2 divisors, whose sum is σ = 620732. Its totient is φ = 620730.

The previous prime is 620717. The next prime is 620743. The reversal of 620731 is 137026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 620731 - 2⁷ = 620603 is a prime.

It is a super-2 number, since 2×620731² = 770613948722, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 620699 and 620708.

It is not a weakly prime, because it can be changed into another prime (620771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310365 + 310366.

It is an arithmetic number, because the mean of its divisors is an integer number (310366).

2⁶²⁰⁷³¹ is an apocalyptic number.

620731 is a deficient number, since it is larger than the sum of its proper divisors (1).

620731 is an equidigital number, since it uses as much as digits as its factorization.

620731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 620731 is about 787.8648361236. The cubic root of 620731 is about 85.3036887723.

Adding to 620731 its reverse (137026), we get a palindrome (757757).

The spelling of 620731 in words is "six hundred twenty thousand, seven hundred thirty-one".