51507243 has 12 divisors (see below), whose sum is σ = 74711208. Its totient is φ = 34194240.

The previous prime is 51507221. The next prime is 51507257. The reversal of 51507243 is 34270515.

It is a happy number.

It is not a de Polignac number, because 51507243 - 2⁹ = 51506731 is a prime.

It is a super-2 number, since 2×51507243² = 5305992162922098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51507283) 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, 9705 + ... + 14042.

It is an arithmetic number, because the mean of its divisors is an integer number (6225934).

Almost surely, 2^51507243 is an apocalyptic number.

51507243 is a deficient number, since it is larger than the sum of its proper divisors (23203965).

51507243 is a wasteful number, since it uses less digits than its factorization.

51507243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23994 (or 23991 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51507243 is about 7176.8546731838. The cubic root of 51507243 is about 372.0683840638.

Adding to 51507243 its reverse (34270515), we get a palindrome (85777758).

The spelling of 51507243 in words is "fifty-one million, five hundred seven thousand, two hundred forty-three".