111545222381 has 2 divisors, whose sum is σ = 111545222382. Its totient is φ = 111545222380.

The previous prime is 111545222359. The next prime is 111545222413. The reversal of 111545222381 is 183222545111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101451805225 + 10093417156 = 318515^2 + 100466^2 .

It is a cyclic number.

It is not a de Polignac number, because 111545222381 - 2²⁶ = 111478113517 is a prime.

It is a super-2 number, since 2×111545222381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111545222981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55772611190 + 55772611191.

It is an arithmetic number, because the mean of its divisors is an integer number (55772611191).

Almost surely, 2^111545222381 is an apocalyptic number.

It is an amenable number.

111545222381 is a deficient number, since it is larger than the sum of its proper divisors (1).

111545222381 is an equidigital number, since it uses as much as digits as its factorization.

111545222381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

Adding to 111545222381 its reverse (183222545111), we get a palindrome (294767767492).

The spelling of 111545222381 in words is "one hundred eleven billion, five hundred forty-five million, two hundred twenty-two thousand, three hundred eighty-one".