51151251 has 4 divisors (see below), whose sum is σ = 68201672. Its totient is φ = 34100832.

The previous prime is 51151229. The next prime is 51151297. The reversal of 51151251 is 15215115.

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

It is not a de Polignac number, because 51151251 - 2²² = 46956947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51151951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8525206 + ... + 8525211.

It is an arithmetic number, because the mean of its divisors is an integer number (17050418).

Almost surely, 2^51151251 is an apocalyptic number.

51151251 is a deficient number, since it is larger than the sum of its proper divisors (17050421).

51151251 is a wasteful number, since it uses less digits than its factorization.

51151251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17050420.

The product of its digits is 250, while the sum is 21.

The square root of 51151251 is about 7152.0102768383. The cubic root of 51151251 is about 371.2092188423.

Adding to 51151251 its reverse (15215115), we get a palindrome (66366366).

The spelling of 51151251 in words is "fifty-one million, one hundred fifty-one thousand, two hundred fifty-one".