91391835652 has 24 divisors (see below), whose sum is σ = 172612123992. Its totient is φ = 42089337600.

The previous prime is 91391835643. The next prime is 91391835653. The reversal of 91391835652 is 25653819319.

It can be written as a sum of positive squares in 4 ways, for example, as 12883158016 + 78508677636 = 113504^2 + 280194^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 91391835652.

It is not an unprimeable number, because it can be changed into a prime (91391835653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1882249 + ... + 1930192.

It is an arithmetic number, because the mean of its divisors is an integer number (7192171833).

Almost surely, 2^91391835652 is an apocalyptic number.

It is an amenable number.

91391835652 is a deficient number, since it is larger than the sum of its proper divisors (81220288340).

91391835652 is a wasteful number, since it uses less digits than its factorization.

91391835652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3812919 (or 3812917 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The spelling of 91391835652 in words is "ninety-one billion, three hundred ninety-one million, eight hundred thirty-five thousand, six hundred fifty-two".