51489199 has 2 divisors, whose sum is σ = 51489200. Its totient is φ = 51489198.

The previous prime is 51489197. The next prime is 51489223. The reversal of 51489199 is 99198415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51489199 - 2¹ = 51489197 is a prime.

It is a super-2 number, since 2×51489199² = 5302275227323202, which contains 22 as substring.

Together with 51489197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51489197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25744599 + 25744600.

It is an arithmetic number, because the mean of its divisors is an integer number (25744600).

Almost surely, 2^51489199 is an apocalyptic number.

51489199 is a deficient number, since it is larger than the sum of its proper divisors (1).

51489199 is an equidigital number, since it uses as much as digits as its factorization.

51489199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 46.

The square root of 51489199 is about 7175.5974664135. The cubic root of 51489199 is about 372.0249313656.

The spelling of 51489199 in words is "fifty-one million, four hundred eighty-nine thousand, one hundred ninety-nine".