1111431281 has 2 divisors, whose sum is σ = 1111431282. Its totient is φ = 1111431280.

The previous prime is 1111431247. The next prime is 1111431289. The reversal of 1111431281 is 1821341111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 771950656 + 339480625 = 27784^2 + 18425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111431281 - 2²⁶ = 1044322417 is a prime.

It is a super-2 number, since 2×1111431281² = 2470558984770601922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1111431289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555715640 + 555715641.

It is an arithmetic number, because the mean of its divisors is an integer number (555715641).

Almost surely, 2^1111431281 is an apocalyptic number.

It is an amenable number.

1111431281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111431281 is an equidigital number, since it uses as much as digits as its factorization.

1111431281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 23.

The square root of 1111431281 is about 33338.1355357494. The cubic root of 1111431281 is about 1035.8436433259.

Adding to 1111431281 its reverse (1821341111), we get a palindrome (2932772392).

The spelling of 1111431281 in words is "one billion, one hundred eleven million, four hundred thirty-one thousand, two hundred eighty-one".