2161171567 has 2 divisors, whose sum is σ = 2161171568. Its totient is φ = 2161171566.

The previous prime is 2161171561. The next prime is 2161171633. The reversal of 2161171567 is 7651711612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161171567 - 2³ = 2161171559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161171561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080585783 + 1080585784.

It is an arithmetic number, because the mean of its divisors is an integer number (1080585784).

Almost surely, 2^2161171567 is an apocalyptic number.

2161171567 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161171567 is an equidigital number, since it uses as much as digits as its factorization.

2161171567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 37.

The square root of 2161171567 is about 46488.4024999784. The cubic root of 2161171567 is about 1292.8944814617.

The spelling of 2161171567 in words is "two billion, one hundred sixty-one million, one hundred seventy-one thousand, five hundred sixty-seven".