51403903 has 4 divisors (see below), whose sum is σ = 54427680. Its totient is φ = 48380128.

The previous prime is 51403897. The next prime is 51403909. The reversal of 51403903 is 30930415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30930415 = 5 ⋅6186083.

It is an interprime number because it is at equal distance from previous prime (51403897) and next prime (51403909).

It is a cyclic number.

It is not a de Polignac number, because 51403903 - 2⁵ = 51403871 is a prime.

It is a super-2 number, since 2×51403903² = 5284722487266818, 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 (51403909) 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, 1511863 + ... + 1511896.

It is an arithmetic number, because the mean of its divisors is an integer number (13606920).

Almost surely, 2^51403903 is an apocalyptic number.

51403903 is a deficient number, since it is larger than the sum of its proper divisors (3023777).

51403903 is a wasteful number, since it uses less digits than its factorization.

51403903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023776.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 51403903 is about 7169.6515257019. The cubic root of 51403903 is about 371.8193880825.

The spelling of 51403903 in words is "fifty-one million, four hundred three thousand, nine hundred three".