1129956491 has 2 divisors, whose sum is σ = 1129956492. Its totient is φ = 1129956490.

The previous prime is 1129956463. The next prime is 1129956511. The reversal of 1129956491 is 1946599211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1129956491 - 2¹⁰ = 1129955467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1129956691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564978245 + 564978246.

It is an arithmetic number, because the mean of its divisors is an integer number (564978246).

Almost surely, 2^1129956491 is an apocalyptic number.

1129956491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129956491 is an equidigital number, since it uses as much as digits as its factorization.

1129956491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The square root of 1129956491 is about 33614.8254643691. The cubic root of 1129956491 is about 1041.5670689570.

The spelling of 1129956491 in words is "one billion, one hundred twenty-nine million, nine hundred fifty-six thousand, four hundred ninety-one".