624542969 has 4 divisors (see below), whose sum is σ = 627031440. Its totient is φ = 622054500.

The previous prime is 624542951. The next prime is 624542981. The reversal of 624542969 is 969245426.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 969245426 = 2 ⋅484622713.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624542969 is a prime.

It is a super-2 number, since 2×624542969² = 780107840254669922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (624542929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1243859 + ... + 1244360.

It is an arithmetic number, because the mean of its divisors is an integer number (156757860).

Almost surely, 2^624542969 is an apocalyptic number.

It is an amenable number.

624542969 is a deficient number, since it is larger than the sum of its proper divisors (2488471).

624542969 is a wasteful number, since it uses less digits than its factorization.

624542969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488470.

The product of its digits is 933120, while the sum is 47.

The square root of 624542969 is about 24990.8577083701. The cubic root of 624542969 is about 854.7795193149.

The spelling of 624542969 in words is "six hundred twenty-four million, five hundred forty-two thousand, nine hundred sixty-nine".