51240233 has 12 divisors (see below), whose sum is σ = 57103284. Its totient is φ = 45936000.

The previous prime is 51240221. The next prime is 51240253. The reversal of 51240233 is 33204215.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42549529 + 8690704 = 6523^2 + 2948^2 .

It is not a de Polignac number, because 51240233 - 2⁸ = 51239977 is a prime.

It is a super-2 number, since 2×51240233² = 5251122955788578, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51240253) 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, 5933 + ... + 11733.

It is an arithmetic number, because the mean of its divisors is an integer number (4758607).

Almost surely, 2^51240233 is an apocalyptic number.

It is an amenable number.

51240233 is a deficient number, since it is larger than the sum of its proper divisors (5863051).

51240233 is a wasteful number, since it uses less digits than its factorization.

51240233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896 (or 5885 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 51240233 is about 7158.2283422646. The cubic root of 51240233 is about 371.4243442672.

Adding to 51240233 its reverse (33204215), we get a palindrome (84444448).

The spelling of 51240233 in words is "fifty-one million, two hundred forty thousand, two hundred thirty-three".