51256403 has 4 divisors (see below), whose sum is σ = 55916088. Its totient is φ = 46596720.

The previous prime is 51256399. The next prime is 51256417. The reversal of 51256403 is 30465215.

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

It is a cyclic number.

It is not a de Polignac number, because 51256403 - 2² = 51256399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51256453) 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, 2329826 + ... + 2329847.

It is an arithmetic number, because the mean of its divisors is an integer number (13979022).

Almost surely, 2^51256403 is an apocalyptic number.

51256403 is a deficient number, since it is larger than the sum of its proper divisors (4659685).

51256403 is a wasteful number, since it uses less digits than its factorization.

51256403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659684.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 51256403 is about 7159.3577225894. The cubic root of 51256403 is about 371.4634105740.

The spelling of 51256403 in words is "fifty-one million, two hundred fifty-six thousand, four hundred three".