161748791 has 2 divisors, whose sum is σ = 161748792. Its totient is φ = 161748790.

The previous prime is 161748781. The next prime is 161748799. The reversal of 161748791 is 197847161.

161748791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161748791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161748799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80874395 + 80874396.

It is an arithmetic number, because the mean of its divisors is an integer number (80874396).

Almost surely, 2^161748791 is an apocalyptic number.

161748791 is a deficient number, since it is larger than the sum of its proper divisors (1).

161748791 is an equidigital number, since it uses as much as digits as its factorization.

161748791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 44.

The square root of 161748791 is about 12718.0498111935. The cubic root of 161748791 is about 544.8542561217.

The spelling of 161748791 in words is "one hundred sixty-one million, seven hundred forty-eight thousand, seven hundred ninety-one".