51091559 has 4 divisors (see below), whose sum is σ = 51243504. Its totient is φ = 50939616.

The previous prime is 51091543. The next prime is 51091567. The reversal of 51091559 is 95519015.

It is a happy number.

51091559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51091559 - 2⁴ = 51091543 is a prime.

It is a super-2 number, since 2×51091559² = 5220694802100962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75467 + ... + 76140.

It is an arithmetic number, because the mean of its divisors is an integer number (12810876).

Almost surely, 2^51091559 is an apocalyptic number.

51091559 is a deficient number, since it is larger than the sum of its proper divisors (151945).

51091559 is a wasteful number, since it uses less digits than its factorization.

51091559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151944.

The product of its (nonzero) digits is 10125, while the sum is 35.

The square root of 51091559 is about 7147.8359662208. The cubic root of 51091559 is about 371.0647659034.

The spelling of 51091559 in words is "fifty-one million, ninety-one thousand, five hundred fifty-nine".