91130047285 has 4 divisors (see below), whose sum is σ = 109356056748. Its totient is φ = 72904037824.

The previous prime is 91130047273. The next prime is 91130047313. The reversal of 91130047285 is 58274003119.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68647144036 + 22482903249 = 262006^2 + 149943^2 .

It is a cyclic number.

It is not a de Polignac number, because 91130047285 - 2²⁵ = 91096492853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9113004724 + ... + 9113004733.

It is an arithmetic number, because the mean of its divisors is an integer number (27339014187).

Almost surely, 2^91130047285 is an apocalyptic number.

It is an amenable number.

91130047285 is a deficient number, since it is larger than the sum of its proper divisors (18226009463).

91130047285 is a wasteful number, since it uses less digits than its factorization.

91130047285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18226009462.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 91130047285 in words is "ninety-one billion, one hundred thirty million, forty-seven thousand, two hundred eighty-five".