51042251 has 8 divisors (see below), whose sum is σ = 55181280. Its totient is φ = 46933632.

The previous prime is 51042241. The next prime is 51042263. The reversal of 51042251 is 15224015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51042251 - 2¹⁰ = 51041227 is a prime.

It is a super-2 number, since 2×51042251² = 5210622774294002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51042241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4046 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (6897660).

Almost surely, 2^51042251 is an apocalyptic number.

51042251 is a deficient number, since it is larger than the sum of its proper divisors (4139029).

51042251 is a wasteful number, since it uses less digits than its factorization.

51042251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15205.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51042251 is about 7144.3859778150. The cubic root of 51042251 is about 370.9453570688.

Adding to 51042251 its reverse (15224015), we get a palindrome (66266266).

The spelling of 51042251 in words is "fifty-one million, forty-two thousand, two hundred fifty-one".