51257869 has 12 divisors (see below), whose sum is σ = 57921696. Its totient is φ = 45254352.

The previous prime is 51257867. The next prime is 51257887. The reversal of 51257869 is 96875215.

51257869 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 51257869 - 2¹ = 51257867 is a prime.

It is a super-2 number, since 2×51257869² = 5254738268842322, 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 (51257863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2707 + ... + 10480.

It is an arithmetic number, because the mean of its divisors is an integer number (4826808).

Almost surely, 2^51257869 is an apocalyptic number.

It is an amenable number.

51257869 is a deficient number, since it is larger than the sum of its proper divisors (6663827).

51257869 is a wasteful number, since it uses less digits than its factorization.

51257869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13236 (or 13223 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 51257869 is about 7159.4601053431. The cubic root of 51257869 is about 371.4669519863.

The spelling of 51257869 in words is "fifty-one million, two hundred fifty-seven thousand, eight hundred sixty-nine".