51317258 has 4 divisors (see below), whose sum is σ = 76975890. Its totient is φ = 25658628.

The previous prime is 51317251. The next prime is 51317291. The reversal of 51317258 is 85271315.

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

It can be written as a sum of positive squares in only one way, i.e., 36517849 + 14799409 = 6043^2 + 3847^2 .

It is not an unprimeable number, because it can be changed into a prime (51317251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829313 + ... + 12829316.

Almost surely, 2^51317258 is an apocalyptic number.

51317258 is a deficient number, since it is larger than the sum of its proper divisors (25658632).

51317258 is a wasteful number, since it uses less digits than its factorization.

51317258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25658631.

The product of its digits is 8400, while the sum is 32.

The square root of 51317258 is about 7163.6064939387. The cubic root of 51317258 is about 371.6103610960.

It can be divided in two parts, 513 and 17258, that added together give a palindrome (17771).

The spelling of 51317258 in words is "fifty-one million, three hundred seventeen thousand, two hundred fifty-eight".