51603621 has 16 divisors (see below), whose sum is σ = 70203840. Its totient is φ = 33707520.

The previous prime is 51603613. The next prime is 51603649. The reversal of 51603621 is 12630615.

It is not a de Polignac number, because 51603621 - 2³ = 51603613 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51603591 and 51603600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51603691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76341 + ... + 77013.

It is an arithmetic number, because the mean of its divisors is an integer number (4387740).

Almost surely, 2^51603621 is an apocalyptic number.

It is an amenable number.

51603621 is a deficient number, since it is larger than the sum of its proper divisors (18600219).

51603621 is a wasteful number, since it uses less digits than its factorization.

51603621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51603621 is about 7183.5660364474. The cubic root of 51603621 is about 372.3003052579.

The spelling of 51603621 in words is "fifty-one million, six hundred three thousand, six hundred twenty-one".