1129956691 has 2 divisors, whose sum is σ = 1129956692. Its totient is φ = 1129956690.

The previous prime is 1129956677. The next prime is 1129956703. The reversal of 1129956691 is 1966599211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1129956691 - 2²¹ = 1127859539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1129956491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564978345 + 564978346.

It is an arithmetic number, because the mean of its divisors is an integer number (564978346).

Almost surely, 2^1129956691 is an apocalyptic number.

1129956691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129956691 is an equidigital number, since it uses as much as digits as its factorization.

1129956691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 49.

The square root of 1129956691 is about 33614.8284392469. The cubic root of 1129956691 is about 1041.5671304088.

The spelling of 1129956691 in words is "one billion, one hundred twenty-nine million, nine hundred fifty-six thousand, six hundred ninety-one".