91291518606553 has 4 divisors (see below), whose sum is σ = 91291556025808. Its totient is φ = 91291481187300.

The previous prime is 91291518606539. The next prime is 91291518606577. The reversal of 91291518606553 is 35560681519219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91291518606553 - 2¹³ = 91291518598361 is a prime.

It is a super-2 number, since 2×91291518606553² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91291518606491 and 91291518606500.

It is not an unprimeable number, because it can be changed into a prime (91291518606593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14774151 + ... + 20021452.

It is an arithmetic number, because the mean of its divisors is an integer number (22822889006452).

Almost surely, 2^{91291518606553} is an apocalyptic number.

It is an amenable number.

91291518606553 is a deficient number, since it is larger than the sum of its proper divisors (37419255).

91291518606553 is a wasteful number, since it uses less digits than its factorization.

91291518606553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37419254.

The product of its (nonzero) digits is 17496000, while the sum is 61.

The spelling of 91291518606553 in words is "ninety-one trillion, two hundred ninety-one billion, five hundred eighteen million, six hundred six thousand, five hundred fifty-three".