1691230441 has 2 divisors, whose sum is σ = 1691230442. Its totient is φ = 1691230440.

The previous prime is 1691230427. The next prime is 1691230481. The reversal of 1691230441 is 1440321961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1664232025 + 26998416 = 40795^2 + 5196^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691230441 - 2²¹ = 1689133289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1691230481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845615220 + 845615221.

It is an arithmetic number, because the mean of its divisors is an integer number (845615221).

Almost surely, 2^1691230441 is an apocalyptic number.

It is an amenable number.

1691230441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691230441 is an equidigital number, since it uses as much as digits as its factorization.

1691230441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1691230441 is about 41124.5722287783. The cubic root of 1691230441 is about 1191.4274330870.

The spelling of 1691230441 in words is "one billion, six hundred ninety-one million, two hundred thirty thousand, four hundred forty-one".