111545337721 has 2 divisors, whose sum is σ = 111545337722. Its totient is φ = 111545337720.

The previous prime is 111545337707. The next prime is 111545337763. The reversal of 111545337721 is 127733545111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110848377721 + 696960000 = 332939^2 + 26400^2 .

It is an emirp because it is prime and its reverse (127733545111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111545337721 - 2⁷ = 111545337593 is a prime.

It is not a weakly prime, because it can be changed into another prime (111545337781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55772668860 + 55772668861.

It is an arithmetic number, because the mean of its divisors is an integer number (55772668861).

Almost surely, 2^111545337721 is an apocalyptic number.

It is an amenable number.

111545337721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111545337721 is an equidigital number, since it uses as much as digits as its factorization.

111545337721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 40.

The spelling of 111545337721 in words is "one hundred eleven billion, five hundred forty-five million, three hundred thirty-seven thousand, seven hundred twenty-one".