51103993 has 8 divisors (see below), whose sum is σ = 53603712. Its totient is φ = 48663216.

The previous prime is 51103979. The next prime is 51104033. The reversal of 51103993 is 39930115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51103993 - 2⁵ = 51103961 is a prime.

It is a super-2 number, since 2×51103993² = 5223236201088098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51103933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12955 + ... + 16432.

It is an arithmetic number, because the mean of its divisors is an integer number (6700464).

Almost surely, 2^51103993 is an apocalyptic number.

It is an amenable number.

51103993 is a deficient number, since it is larger than the sum of its proper divisors (2499719).

51103993 is a wasteful number, since it uses less digits than its factorization.

51103993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29471.

The product of its (nonzero) digits is 3645, while the sum is 31.

The square root of 51103993 is about 7148.7056870457. The cubic root of 51103993 is about 371.0948651028.

The spelling of 51103993 in words is "fifty-one million, one hundred three thousand, nine hundred ninety-three".