1917326491 has 2 divisors, whose sum is σ = 1917326492. Its totient is φ = 1917326490.

The previous prime is 1917326449. The next prime is 1917326519. The reversal of 1917326491 is 1946237191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1917326491 - 2¹¹ = 1917324443 is a prime.

It is a super-2 number, since 2×1917326491² = 7352281746180746162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1917321491) 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, 958663245 + 958663246.

It is an arithmetic number, because the mean of its divisors is an integer number (958663246).

Almost surely, 2^1917326491 is an apocalyptic number.

1917326491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1917326491 is an equidigital number, since it uses as much as digits as its factorization.

1917326491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 1917326491 is about 43787.2868650251. The cubic root of 1917326491 is about 1242.3158445443.

The spelling of 1917326491 in words is "one billion, nine hundred seventeen million, three hundred twenty-six thousand, four hundred ninety-one".