161451791 has 2 divisors, whose sum is σ = 161451792. Its totient is φ = 161451790.

The previous prime is 161451761. The next prime is 161451803. The reversal of 161451791 is 197154161.

It is a strong prime.

It is an emirp because it is prime and its reverse (197154161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161451791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161451761) 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, 80725895 + 80725896.

It is an arithmetic number, because the mean of its divisors is an integer number (80725896).

Almost surely, 2^161451791 is an apocalyptic number.

161451791 is a deficient number, since it is larger than the sum of its proper divisors (1).

161451791 is an equidigital number, since it uses as much as digits as its factorization.

161451791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 161451791 is about 12706.3681278326. The cubic root of 161451791 is about 544.5205681873.

The spelling of 161451791 in words is "one hundred sixty-one million, four hundred fifty-one thousand, seven hundred ninety-one".