111390397505 has 4 divisors (see below), whose sum is σ = 133668477012. Its totient is φ = 89112318000.

The previous prime is 111390397463. The next prime is 111390397513. The reversal of 111390397505 is 505793093111.

It is a Cunningham number, because it is equal to 333752²+1.

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 40100863504 + 71289534001 = 200252^2 + 267001^2 .

It is not a de Polignac number, because 111390397505 - 2²⁶ = 111323288641 is a prime.

It is a Duffinian number.

It is a Curzon 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, 11139039746 + ... + 11139039755.

It is an arithmetic number, because the mean of its divisors is an integer number (33417119253).

Almost surely, 2^111390397505 is an apocalyptic number.

It is an amenable number.

111390397505 is a deficient number, since it is larger than the sum of its proper divisors (22278079507).

111390397505 is an equidigital number, since it uses as much as digits as its factorization.

111390397505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22278079506.

The product of its (nonzero) digits is 127575, while the sum is 44.

The spelling of 111390397505 in words is "one hundred eleven billion, three hundred ninety million, three hundred ninety-seven thousand, five hundred five".