171679961 has 2 divisors, whose sum is σ = 171679962. Its totient is φ = 171679960.

The previous prime is 171679931. The next prime is 171679973. The reversal of 171679961 is 169976171.

171679961 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 can be written as a sum of positive squares in only one way, i.e., 167857936 + 3822025 = 12956^2 + 1955^2 .

It is an emirp because it is prime and its reverse (169976171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171679961 is a prime.

It is not a weakly prime, because it can be changed into another prime (171679931) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85839980 + 85839981.

It is an arithmetic number, because the mean of its divisors is an integer number (85839981).

Almost surely, 2^171679961 is an apocalyptic number.

It is an amenable number.

171679961 is a deficient number, since it is larger than the sum of its proper divisors (1).

171679961 is an equidigital number, since it uses as much as digits as its factorization.

171679961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 47.

The square root of 171679961 is about 13102.6699950812. The cubic root of 171679961 is about 555.7846337791.

The spelling of 171679961 in words is "one hundred seventy-one million, six hundred seventy-nine thousand, nine hundred sixty-one".