1344661891 has 2 divisors, whose sum is σ = 1344661892. Its totient is φ = 1344661890.

The previous prime is 1344661847. The next prime is 1344661897. The reversal of 1344661891 is 1981664431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1344661891 - 2¹⁷ = 1344530819 is a prime.

It is a super-2 number, since 2×1344661891² = 3616231202215391762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1344661897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672330945 + 672330946.

It is an arithmetic number, because the mean of its divisors is an integer number (672330946).

Almost surely, 2^1344661891 is an apocalyptic number.

1344661891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1344661891 is an equidigital number, since it uses as much as digits as its factorization.

1344661891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 1344661891 is about 36669.6317270845. The cubic root of 1344661891 is about 1103.7508022381.

The spelling of 1344661891 in words is "one billion, three hundred forty-four million, six hundred sixty-one thousand, eight hundred ninety-one".