1111431161 has 2 divisors, whose sum is σ = 1111431162. Its totient is φ = 1111431160.

The previous prime is 1111431131. The next prime is 1111431247. The reversal of 1111431161 is 1611341111.

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., 817960000 + 293471161 = 28600^2 + 17131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111431161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111431131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555715580 + 555715581.

It is an arithmetic number, because the mean of its divisors is an integer number (555715581).

Almost surely, 2^1111431161 is an apocalyptic number.

It is an amenable number.

1111431161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111431161 is an equidigital number, since it uses as much as digits as its factorization.

1111431161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 20.

The square root of 1111431161 is about 33338.1337360087. The cubic root of 1111431161 is about 1035.8436060462.

Adding to 1111431161 its reverse (1611341111), we get a palindrome (2722772272).

The spelling of 1111431161 in words is "one billion, one hundred eleven million, four hundred thirty-one thousand, one hundred sixty-one".