624103681 has 4 divisors (see below), whose sum is σ = 639325764. Its totient is φ = 608881600.

The previous prime is 624103663. The next prime is 624103729. The reversal of 624103681 is 186301426.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67568400 + 556535281 = 8220^2 + 23591^2 .

It is a cyclic number.

It is not a de Polignac number, because 624103681 - 2¹¹ = 624101633 is a prime.

It is a super-2 number, since 2×624103681² = 779010809275499522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (624103661) 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, 7610980 + ... + 7611061.

It is an arithmetic number, because the mean of its divisors is an integer number (159831441).

Almost surely, 2^624103681 is an apocalyptic number.

It is an amenable number.

624103681 is a deficient number, since it is larger than the sum of its proper divisors (15222083).

624103681 is a wasteful number, since it uses less digits than its factorization.

624103681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15222082.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 624103681 is about 24982.0671882853. The cubic root of 624103681 is about 854.5790620866.

The spelling of 624103681 in words is "six hundred twenty-four million, one hundred three thousand, six hundred eighty-one".