161723767 has 2 divisors, whose sum is σ = 161723768. Its totient is φ = 161723766.

The previous prime is 161723753. The next prime is 161723777. The reversal of 161723767 is 767327161.

It is a strong prime.

It is an emirp because it is prime and its reverse (767327161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161723767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161723777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80861883 + 80861884.

It is an arithmetic number, because the mean of its divisors is an integer number (80861884).

Almost surely, 2^161723767 is an apocalyptic number.

161723767 is a deficient number, since it is larger than the sum of its proper divisors (1).

161723767 is an equidigital number, since it uses as much as digits as its factorization.

161723767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 40.

The square root of 161723767 is about 12717.0659745084. The cubic root of 161723767 is about 544.8261567131.

The spelling of 161723767 in words is "one hundred sixty-one million, seven hundred twenty-three thousand, seven hundred sixty-seven".