111528538797391 has 16 divisors (see below), whose sum is σ = 114912705404448. Its totient is φ = 108176028249600.

The previous prime is 111528538797367. The next prime is 111528538797397. The reversal of 111528538797391 is 193797835825111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111528538797391 - 2²¹ = 111528536700239 is a prime.

It is a super-2 number, since 2×111528538797391² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111528538797391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111528538797397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246234211 + ... + 246686731.

It is an arithmetic number, because the mean of its divisors is an integer number (7182044087778).

Almost surely, 2^{111528538797391} is an apocalyptic number.

111528538797391 is a deficient number, since it is larger than the sum of its proper divisors (3384166607057).

111528538797391 is a wasteful number, since it uses less digits than its factorization.

111528538797391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487482.

The product of its digits is 114307200, while the sum is 70.

The spelling of 111528538797391 in words is "one hundred eleven trillion, five hundred twenty-eight billion, five hundred thirty-eight million, seven hundred ninety-seven thousand, three hundred ninety-one".