51132251 has 4 divisors (see below), whose sum is σ = 51158904. Its totient is φ = 51105600.

The previous prime is 51132239. The next prime is 51132253. The reversal of 51132251 is 15223115.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51132251 - 2¹⁸ = 50870107 is a prime.

It is a super-2 number, since 2×51132251² = 5229014184654002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51132253) 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, 10205 + ... + 14366.

It is an arithmetic number, because the mean of its divisors is an integer number (12789726).

Almost surely, 2^51132251 is an apocalyptic number.

51132251 is a deficient number, since it is larger than the sum of its proper divisors (26653).

51132251 is a wasteful number, since it uses less digits than its factorization.

51132251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26652.

The product of its digits is 300, while the sum is 20.

The square root of 51132251 is about 7150.6818555995. The cubic root of 51132251 is about 371.1632515820.

Adding to 51132251 its reverse (15223115), we get a palindrome (66355366).

The spelling of 51132251 in words is "fifty-one million, one hundred thirty-two thousand, two hundred fifty-one".