1129216391 has 2 divisors, whose sum is σ = 1129216392. Its totient is φ = 1129216390.

The previous prime is 1129216351. The next prime is 1129216393. The reversal of 1129216391 is 1936129211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1129216391 is a prime.

Together with 1129216393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129216393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564608195 + 564608196.

It is an arithmetic number, because the mean of its divisors is an integer number (564608196).

Almost surely, 2^1129216391 is an apocalyptic number.

1129216391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129216391 is an equidigital number, since it uses as much as digits as its factorization.

1129216391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 1129216391 is about 33603.8151256669. The cubic root of 1129216391 is about 1041.3396170874.

The spelling of 1129216391 in words is "one billion, one hundred twenty-nine million, two hundred sixteen thousand, three hundred ninety-one".