51899251 has 2 divisors, whose sum is σ = 51899252. Its totient is φ = 51899250.

The previous prime is 51899219. The next prime is 51899261. The reversal of 51899251 is 15299815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51899251 - 2⁵ = 51899219 is a prime.

It is a super-2 number, since 2×51899251² = 5387064508722002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51899261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25949625 + 25949626.

It is an arithmetic number, because the mean of its divisors is an integer number (25949626).

Almost surely, 2^51899251 is an apocalyptic number.

51899251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51899251 is an equidigital number, since it uses as much as digits as its factorization.

51899251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 40.

The square root of 51899251 is about 7204.1134777292. The cubic root of 51899251 is about 373.0099042142.

The spelling of 51899251 in words is "fifty-one million, eight hundred ninety-nine thousand, two hundred fifty-one".