2171131783 has 2 divisors, whose sum is σ = 2171131784. Its totient is φ = 2171131782.

The previous prime is 2171131709. The next prime is 2171131789. The reversal of 2171131783 is 3871311712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171131783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171131789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085565891 + 1085565892.

It is an arithmetic number, because the mean of its divisors is an integer number (1085565892).

Almost surely, 2^2171131783 is an apocalyptic number.

2171131783 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171131783 is an equidigital number, since it uses as much as digits as its factorization.

2171131783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 2171131783 is about 46595.4051704672. The cubic root of 2171131783 is about 1294.8776304918.

The spelling of 2171131783 in words is "two billion, one hundred seventy-one million, one hundred thirty-one thousand, seven hundred eighty-three".