1115555431 has 2 divisors, whose sum is σ = 1115555432. Its totient is φ = 1115555430.

The previous prime is 1115555423. The next prime is 1115555447. The reversal of 1115555431 is 1345555111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1115555431 - 2³ = 1115555423 is a prime.

It is a super-2 number, since 2×1115555431² = 2488927839267191522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1115555393 and 1115555402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115555411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557777715 + 557777716.

It is an arithmetic number, because the mean of its divisors is an integer number (557777716).

Almost surely, 2^1115555431 is an apocalyptic number.

1115555431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115555431 is an equidigital number, since it uses as much as digits as its factorization.

1115555431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7500, while the sum is 31.

The square root of 1115555431 is about 33399.9316017264. The cubic root of 1115555431 is about 1037.1232850347.

The spelling of 1115555431 in words is "one billion, one hundred fifteen million, five hundred fifty-five thousand, four hundred thirty-one".