51457801 has 4 divisors (see below), whose sum is σ = 51476292. Its totient is φ = 51439312.

The previous prime is 51457789. The next prime is 51457807. The reversal of 51457801 is 10875415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10875415 = 5 ⋅2175083.

It can be written as a sum of positive squares in 2 ways, for example, as 24000201 + 27457600 = 4899^2 + 5240^2 .

It is a cyclic number.

It is not a de Polignac number, because 51457801 - 2⁷ = 51457673 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51457807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4126 + ... + 10951.

It is an arithmetic number, because the mean of its divisors is an integer number (12869073).

Almost surely, 2^51457801 is an apocalyptic number.

It is an amenable number.

51457801 is a deficient number, since it is larger than the sum of its proper divisors (18491).

51457801 is a wasteful number, since it uses less digits than its factorization.

51457801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18490.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 51457801 is about 7173.4093010228. The cubic root of 51457801 is about 371.9492959952.

The spelling of 51457801 in words is "fifty-one million, four hundred fifty-seven thousand, eight hundred one".