111281957 has 2 divisors, whose sum is σ = 111281958. Its totient is φ = 111281956.

The previous prime is 111281923. The next prime is 111281969. The reversal of 111281957 is 759182111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96157636 + 15124321 = 9806^2 + 3889^2 .

It is a cyclic number.

It is not a de Polignac number, because 111281957 - 2¹⁰ = 111280933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111281657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55640978 + 55640979.

It is an arithmetic number, because the mean of its divisors is an integer number (55640979).

Almost surely, 2^111281957 is an apocalyptic number.

It is an amenable number.

111281957 is a deficient number, since it is larger than the sum of its proper divisors (1).

111281957 is an equidigital number, since it uses as much as digits as its factorization.

111281957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 35.

The square root of 111281957 is about 10549.0263531759. The cubic root of 111281957 is about 480.9961329962.

The spelling of 111281957 in words is "one hundred eleven million, two hundred eighty-one thousand, nine hundred fifty-seven".