111861553 has 2 divisors, whose sum is σ = 111861554. Its totient is φ = 111861552.

The previous prime is 111861539. The next prime is 111861559. The reversal of 111861553 is 355168111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111682624 + 178929 = 10568^2 + 423^2 .

It is an emirp because it is prime and its reverse (355168111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111861553 - 2⁹ = 111861041 is a prime.

It is not a weakly prime, because it can be changed into another prime (111861559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55930776 + 55930777.

It is an arithmetic number, because the mean of its divisors is an integer number (55930777).

Almost surely, 2^111861553 is an apocalyptic number.

It is an amenable number.

111861553 is a deficient number, since it is larger than the sum of its proper divisors (1).

111861553 is an equidigital number, since it uses as much as digits as its factorization.

111861553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 31.

The square root of 111861553 is about 10576.4622156939. The cubic root of 111861553 is about 481.8297536979.

The spelling of 111861553 in words is "one hundred eleven million, eight hundred sixty-one thousand, five hundred fifty-three".