53181091091 has 4 divisors (see below), whose sum is σ = 53181823800. Its totient is φ = 53180358384.

The previous prime is 53181091079. The next prime is 53181091099. The reversal of 53181091091 is 19019018135.

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 53181091091 - 2¹⁸ = 53180828947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53181091099) 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, 243821 + ... + 407198.

It is an arithmetic number, because the mean of its divisors is an integer number (13295455950).

Almost surely, 2^53181091091 is an apocalyptic number.

53181091091 is a deficient number, since it is larger than the sum of its proper divisors (732709).

53181091091 is an equidigital number, since it uses as much as digits as its factorization.

53181091091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732708.

The product of its (nonzero) digits is 9720, while the sum is 38.

The spelling of 53181091091 in words is "fifty-three billion, one hundred eighty-one million, ninety-one thousand, ninety-one".