1662143291 has 2 divisors, whose sum is σ = 1662143292. Its totient is φ = 1662143290.

The previous prime is 1662143183. The next prime is 1662143317. The reversal of 1662143291 is 1923412661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662143291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1662143591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831071645 + 831071646.

It is an arithmetic number, because the mean of its divisors is an integer number (831071646).

Almost surely, 2^1662143291 is an apocalyptic number.

1662143291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662143291 is an equidigital number, since it uses as much as digits as its factorization.

1662143291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 1662143291 is about 40769.3915946755. The cubic root of 1662143291 is about 1184.5575186916.

The spelling of 1662143291 in words is "one billion, six hundred sixty-two million, one hundred forty-three thousand, two hundred ninety-one".