50891569 has 2 divisors, whose sum is σ = 50891570. Its totient is φ = 50891568.

The previous prime is 50891543. The next prime is 50891573. The reversal of 50891569 is 96519805.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32718400 + 18173169 = 5720^2 + 4263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50891569 is a prime.

It is a super-2 number, since 2×50891569² = 5179903590563522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (50891509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25445784 + 25445785.

It is an arithmetic number, because the mean of its divisors is an integer number (25445785).

Almost surely, 2^50891569 is an apocalyptic number.

It is an amenable number.

50891569 is a deficient number, since it is larger than the sum of its proper divisors (1).

50891569 is an equidigital number, since it uses as much as digits as its factorization.

50891569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 50891569 is about 7133.8327005895. The cubic root of 50891569 is about 370.5799742733.

The spelling of 50891569 in words is "fifty million, eight hundred ninety-one thousand, five hundred sixty-nine".