171292921 has 2 divisors, whose sum is σ = 171292922. Its totient is φ = 171292920.

The previous prime is 171292909. The next prime is 171292931. The reversal of 171292921 is 129292171.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107931321 + 63361600 = 10389^2 + 7960^2 .

It is a cyclic number.

It is not a de Polignac number, because 171292921 - 2⁵ = 171292889 is a prime.

It is not a weakly prime, because it can be changed into another prime (171292931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85646460 + 85646461.

It is an arithmetic number, because the mean of its divisors is an integer number (85646461).

Almost surely, 2^171292921 is an apocalyptic number.

It is an amenable number.

171292921 is a deficient number, since it is larger than the sum of its proper divisors (1).

171292921 is an equidigital number, since it uses as much as digits as its factorization.

171292921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 171292921 is about 13087.8921526730. The cubic root of 171292921 is about 555.3666608315.

The spelling of 171292921 in words is "one hundred seventy-one million, two hundred ninety-two thousand, nine hundred twenty-one".