51261243 has 16 divisors (see below), whose sum is σ = 76578816. Its totient is φ = 30227040.

The previous prime is 51261209. The next prime is 51261263. The reversal of 51261243 is 34216215.

It is not a de Polignac number, because 51261243 - 2⁶ = 51261179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51261263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19771 + ... + 22212.

It is an arithmetic number, because the mean of its divisors is an integer number (4786176).

Almost surely, 2^51261243 is an apocalyptic number.

51261243 is a deficient number, since it is larger than the sum of its proper divisors (25317573).

51261243 is a wasteful number, since it uses less digits than its factorization.

51261243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42034.

The product of its digits is 1440, while the sum is 24.

The square root of 51261243 is about 7159.6957337585. The cubic root of 51261243 is about 371.4751022926.

Adding to 51261243 its reverse (34216215), we get a palindrome (85477458).

The spelling of 51261243 in words is "fifty-one million, two hundred sixty-one thousand, two hundred forty-three".