624391 has 2 divisors, whose sum is σ = 624392. Its totient is φ = 624390.

The previous prime is 624347. The next prime is 624401. The reversal of 624391 is 193426.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 624391 - 2⁹ = 623879 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312195 + 312196.

It is an arithmetic number, because the mean of its divisors is an integer number (312196).

2⁶²⁴³⁹¹ is an apocalyptic number.

624391 is a deficient number, since it is larger than the sum of its proper divisors (1).

624391 is an equidigital number, since it uses as much as digits as its factorization.

624391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 624391 is about 790.1841557511. The cubic root of 624391 is about 85.4710182999.

The spelling of 624391 in words is "six hundred twenty-four thousand, three hundred ninety-one".