51988819 has 2 divisors, whose sum is σ = 51988820. Its totient is φ = 51988818.

The previous prime is 51988789. The next prime is 51988831. The reversal of 51988819 is 91888915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51988819 - 2¹¹ = 51986771 is a prime.

It is a super-2 number, since 2×51988819² = 5405674602029522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51988879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25994409 + 25994410.

It is an arithmetic number, because the mean of its divisors is an integer number (25994410).

Almost surely, 2^51988819 is an apocalyptic number.

51988819 is a deficient number, since it is larger than the sum of its proper divisors (1).

51988819 is an equidigital number, since it uses as much as digits as its factorization.

51988819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 49.

The square root of 51988819 is about 7210.3272463876. The cubic root of 51988819 is about 373.2243617082.

The spelling of 51988819 in words is "fifty-one million, nine hundred eighty-eight thousand, eight hundred nineteen".