51972889 has 2 divisors, whose sum is σ = 51972890. Its totient is φ = 51972888.

The previous prime is 51972821. The next prime is 51972911. The reversal of 51972889 is 98827915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47499664 + 4473225 = 6892^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 51972889 - 2⁹ = 51972377 is a prime.

It is not a weakly prime, because it can be changed into another prime (51972589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25986444 + 25986445.

It is an arithmetic number, because the mean of its divisors is an integer number (25986445).

Almost surely, 2^51972889 is an apocalyptic number.

It is an amenable number.

51972889 is a deficient number, since it is larger than the sum of its proper divisors (1).

51972889 is an equidigital number, since it uses as much as digits as its factorization.

51972889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 49.

The square root of 51972889 is about 7209.2224962197. Note that the first 3 decimals coincide. The cubic root of 51972889 is about 373.1862376682.

The spelling of 51972889 in words is "fifty-one million, nine hundred seventy-two thousand, eight hundred eighty-nine".