91870847053 has 4 divisors (see below), whose sum is σ = 91875583420. Its totient is φ = 91866110688.

The previous prime is 91870847023. The next prime is 91870847069. The reversal of 91870847053 is 35074807819.

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 65371239684 + 26499607369 = 255678^2 + 162787^2 .

It is a cyclic number.

It is not a de Polignac number, because 91870847053 - 2⁹ = 91870846541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91870847023) 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, 2338968 + ... + 2377921.

It is an arithmetic number, because the mean of its divisors is an integer number (22968895855).

Almost surely, 2^91870847053 is an apocalyptic number.

It is an amenable number.

91870847053 is a deficient number, since it is larger than the sum of its proper divisors (4736367).

91870847053 is a wasteful number, since it uses less digits than its factorization.

91870847053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736366.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 91870847053 in words is "ninety-one billion, eight hundred seventy million, eight hundred forty-seven thousand, fifty-three".