1691230427 has 2 divisors, whose sum is σ = 1691230428. Its totient is φ = 1691230426.

The previous prime is 1691230403. The next prime is 1691230441. The reversal of 1691230427 is 7240321961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1691230427 - 2¹⁸ = 1690968283 is a prime.

It is not a weakly prime, because it can be changed into another prime (1691230487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845615213 + 845615214.

It is an arithmetic number, because the mean of its divisors is an integer number (845615214).

Almost surely, 2^1691230427 is an apocalyptic number.

1691230427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691230427 is an equidigital number, since it uses as much as digits as its factorization.

1691230427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 1691230427 is about 41124.5720585637. The cubic root of 1691230427 is about 1191.4274297995.

The spelling of 1691230427 in words is "one billion, six hundred ninety-one million, two hundred thirty thousand, four hundred twenty-seven".