161673761 has 2 divisors, whose sum is σ = 161673762. Its totient is φ = 161673760.

The previous prime is 161673731. The next prime is 161673779. The reversal of 161673761 is 167376161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159542161 + 2131600 = 12631^2 + 1460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161673761 is a prime.

It is a super-2 number, since 2×161673761² = 52276809991770242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (161673731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80836880 + 80836881.

It is an arithmetic number, because the mean of its divisors is an integer number (80836881).

Almost surely, 2^161673761 is an apocalyptic number.

It is an amenable number.

161673761 is a deficient number, since it is larger than the sum of its proper divisors (1).

161673761 is an equidigital number, since it uses as much as digits as its factorization.

161673761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 161673761 is about 12715.0997243435. The cubic root of 161673761 is about 544.7699963729.

The spelling of 161673761 in words is "one hundred sixty-one million, six hundred seventy-three thousand, seven hundred sixty-one".