1111321231 has 2 divisors, whose sum is σ = 1111321232. Its totient is φ = 1111321230.

The previous prime is 1111321207. The next prime is 1111321249. The reversal of 1111321231 is 1321231111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111321231 - 2⁷ = 1111321103 is a prime.

It is a super-2 number, since 2×1111321231² = 2470069756942710722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111321931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555660615 + 555660616.

It is an arithmetic number, because the mean of its divisors is an integer number (555660616).

Almost surely, 2^1111321231 is an apocalyptic number.

1111321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111321231 is an equidigital number, since it uses as much as digits as its factorization.

1111321231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 16.

The square root of 1111321231 is about 33336.4849826733. The cubic root of 1111321231 is about 1035.8094536710.

Adding to 1111321231 its reverse (1321231111), we get a palindrome (2432552342).

It can be divided in two parts, 111 and 1321231, that multiplied together give a palindrome (146656641).

The spelling of 1111321231 in words is "one billion, one hundred eleven million, three hundred twenty-one thousand, two hundred thirty-one".