1121806431 has 12 divisors (see below), whose sum is σ = 1624905360. Its totient is φ = 745785600.

The previous prime is 1121806429. The next prime is 1121806447. The reversal of 1121806431 is 1346081211.

It is a happy number.

1121806431 is a `hidden beast` number, since 1 + 1 + 2 + 18 + 0 + 643 + 1 = 666.

It is not a de Polignac number, because 1121806431 - 2¹ = 1121806429 is a prime.

It is a super-2 number, since 2×1121806431² = 2516899337265915522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1121806395 and 1121806404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121806831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170370 + ... + 176831.

It is an arithmetic number, because the mean of its divisors is an integer number (135408780).

Almost surely, 2^1121806431 is an apocalyptic number.

1121806431 is a deficient number, since it is larger than the sum of its proper divisors (503098929).

1121806431 is a wasteful number, since it uses less digits than its factorization.

1121806431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347566 (or 347563 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1121806431 is about 33493.3789128538. The cubic root of 1121806431 is about 1039.0568467950.

Adding to 1121806431 its reverse (1346081211), we get a palindrome (2467887642).

The spelling of 1121806431 in words is "one billion, one hundred twenty-one million, eight hundred six thousand, four hundred thirty-one".