51633251 has 2 divisors, whose sum is σ = 51633252. Its totient is φ = 51633250.

The previous prime is 51633223. The next prime is 51633269. The reversal of 51633251 is 15233615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51633251 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51633251.

It is not a weakly prime, because it can be changed into another prime (51633451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25816625 + 25816626.

It is an arithmetic number, because the mean of its divisors is an integer number (25816626).

Almost surely, 2^51633251 is an apocalyptic number.

51633251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51633251 is an equidigital number, since it uses as much as digits as its factorization.

51633251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 51633251 is about 7185.6280866741. The cubic root of 51633251 is about 372.3715479806.

Adding to 51633251 its reverse (15233615), we get a palindrome (66866866).

The spelling of 51633251 in words is "fifty-one million, six hundred thirty-three thousand, two hundred fifty-one".