111381947 has 2 divisors, whose sum is σ = 111381948. Its totient is φ = 111381946.

The previous prime is 111381917. The next prime is 111381967. The reversal of 111381947 is 749183111.

It is a strong prime.

It is an emirp because it is prime and its reverse (749183111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111381947 is a prime.

It is not a weakly prime, because it can be changed into another prime (111381917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55690973 + 55690974.

It is an arithmetic number, because the mean of its divisors is an integer number (55690974).

Almost surely, 2^111381947 is an apocalyptic number.

111381947 is a deficient number, since it is larger than the sum of its proper divisors (1).

111381947 is an equidigital number, since it uses as much as digits as its factorization.

111381947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 111381947 is about 10553.7645889986. The cubic root of 111381947 is about 481.1401527666.

The spelling of 111381947 in words is "one hundred eleven million, three hundred eighty-one thousand, nine hundred forty-seven".