51541999 has 4 divisors (see below), whose sum is σ = 52935064. Its totient is φ = 50148936.

The previous prime is 51541991. The next prime is 51542027. The reversal of 51541999 is 99914515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51541999 - 2³ = 51541991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51541991) 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 in 3 ways as a sum of consecutive naturals, for example, 696477 + ... + 696550.

It is an arithmetic number, because the mean of its divisors is an integer number (13233766).

Almost surely, 2^51541999 is an apocalyptic number.

51541999 is a deficient number, since it is larger than the sum of its proper divisors (1393065).

51541999 is a wasteful number, since it uses less digits than its factorization.

51541999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393064.

The product of its digits is 72900, while the sum is 43.

The square root of 51541999 is about 7179.2756598420. The cubic root of 51541999 is about 372.1520532103.

The spelling of 51541999 in words is "fifty-one million, five hundred forty-one thousand, nine hundred ninety-nine".