51999187 has 2 divisors, whose sum is σ = 51999188. Its totient is φ = 51999186.

The previous prime is 51999173. The next prime is 51999191. The reversal of 51999187 is 78199915.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51999187 - 2¹¹ = 51997139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51999187.

It is not a weakly prime, because it can be changed into another prime (51999197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25999593 + 25999594.

It is an arithmetic number, because the mean of its divisors is an integer number (25999594).

Almost surely, 2^51999187 is an apocalyptic number.

51999187 is a deficient number, since it is larger than the sum of its proper divisors (1).

51999187 is an equidigital number, since it uses as much as digits as its factorization.

51999187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 49.

The square root of 51999187 is about 7211.0461793002. The cubic root of 51999187 is about 373.2491704590.

The spelling of 51999187 in words is "fifty-one million, nine hundred ninety-nine thousand, one hundred eighty-seven".