1121247431 has 2 divisors, whose sum is σ = 1121247432. Its totient is φ = 1121247430.

The previous prime is 1121247389. The next prime is 1121247473. The reversal of 1121247431 is 1347421211.

It is a balanced prime because it is at equal distance from previous prime (1121247389) and next prime (1121247473).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121247431 is a prime.

It is a super-2 number, since 2×1121247431² = 2514391603048199522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1121247431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121247481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560623715 + 560623716.

It is an arithmetic number, because the mean of its divisors is an integer number (560623716).

Almost surely, 2^1121247431 is an apocalyptic number.

1121247431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121247431 is an equidigital number, since it uses as much as digits as its factorization.

1121247431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 1121247431 is about 33485.0329401062. The cubic root of 1121247431 is about 1038.8842295873.

Adding to 1121247431 its reverse (1347421211), we get a palindrome (2468668642).

The spelling of 1121247431 in words is "one billion, one hundred twenty-one million, two hundred forty-seven thousand, four hundred thirty-one".