161776451 has 2 divisors, whose sum is σ = 161776452. Its totient is φ = 161776450.

The previous prime is 161776421. The next prime is 161776463. The reversal of 161776451 is 154677161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161776451 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (161776421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80888225 + 80888226.

It is an arithmetic number, because the mean of its divisors is an integer number (80888226).

Almost surely, 2^161776451 is an apocalyptic number.

161776451 is a deficient number, since it is larger than the sum of its proper divisors (1).

161776451 is an equidigital number, since it uses as much as digits as its factorization.

161776451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 161776451 is about 12719.1371955805. The cubic root of 161776451 is about 544.8853121183.

The spelling of 161776451 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, four hundred fifty-one".