1349917991 has 2 divisors, whose sum is σ = 1349917992. Its totient is φ = 1349917990.

The previous prime is 1349917967. The next prime is 1349917993. The reversal of 1349917991 is 1997199431.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1349917991 is a prime.

Together with 1349917993, 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 (1349917993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 674958995 + 674958996.

It is an arithmetic number, because the mean of its divisors is an integer number (674958996).

Almost surely, 2^1349917991 is an apocalyptic number.

1349917991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1349917991 is an equidigital number, since it uses as much as digits as its factorization.

1349917991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 53.

The square root of 1349917991 is about 36741.2301236635. The cubic root of 1349917991 is about 1105.1870696027.

The spelling of 1349917991 in words is "one billion, three hundred forty-nine million, nine hundred seventeen thousand, nine hundred ninety-one".