51232251 has 16 divisors (see below), whose sum is σ = 79170048. Its totient is φ = 28862400.

The previous prime is 51232219. The next prime is 51232261. The reversal of 51232251 is 15223215.

It is not a de Polignac number, because 51232251 - 2⁵ = 51232219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51232261) 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, 15690 + ... + 18671.

It is an arithmetic number, because the mean of its divisors is an integer number (4948128).

Almost surely, 2^51232251 is an apocalyptic number.

51232251 is a deficient number, since it is larger than the sum of its proper divisors (27937797).

51232251 is a wasteful number, since it uses less digits than its factorization.

51232251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34442.

The product of its digits is 600, while the sum is 21.

The square root of 51232251 is about 7157.6707803586. The cubic root of 51232251 is about 371.4050569292.

Adding to 51232251 its reverse (15223215), we get a palindrome (66455466).

The spelling of 51232251 in words is "fifty-one million, two hundred thirty-two thousand, two hundred fifty-one".