624431 has 4 divisors (see below), whose sum is σ = 627264. Its totient is φ = 621600.

The previous prime is 624419. The next prime is 624443. The reversal of 624431 is 134426.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134426 = 2 ⋅67213.

It is an interprime number because it is at equal distance from previous prime (624419) and next prime (624443).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624431 is a prime.

It is a super-2 number, since 2×624431² = 779828147522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (156816).

2⁶²⁴⁴³¹ is an apocalyptic number.

624431 is a deficient number, since it is larger than the sum of its proper divisors (2833).

624431 is a wasteful number, since it uses less digits than its factorization.

624431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832.

The product of its digits is 576, while the sum is 20.

The square root of 624431 is about 790.2094659013. The cubic root of 624431 is about 85.4728434211.

Adding to 624431 its reverse (134426), we get a palindrome (758857).

The spelling of 624431 in words is "six hundred twenty-four thousand, four hundred thirty-one".