51457 has 4 divisors (see below), whose sum is σ = 58816. Its totient is φ = 44100.

The previous prime is 51449. The next prime is 51461. The reversal of 51457 is 75415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75415 = 5 ⋅15083.

It is not a de Polignac number, because 51457 - 2³ = 51449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3669 + ... + 3682.

It is an arithmetic number, because the mean of its divisors is an integer number (14704).

It is a Proth number, since it is equal to 201 ⋅ 2⁸ + 1 and 201 < 2⁸.

2⁵¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

51457 is a deficient number, since it is larger than the sum of its proper divisors (7359).

51457 is an equidigital number, since it uses as much as digits as its factorization.

51457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7358.

The product of its digits is 700, while the sum is 22.

The square root of 51457 is about 226.8413542545. The cubic root of 51457 is about 37.1947366045.

The spelling of 51457 in words is "fifty-one thousand, four hundred fifty-seven".