169472021 has 2 divisors, whose sum is σ = 169472022. Its totient is φ = 169472020.

The previous prime is 169471961. The next prime is 169472029. The reversal of 169472021 is 120274961.

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., 169390225 + 81796 = 13015^2 + 286^2 .

It is an emirp because it is prime and its reverse (120274961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169472021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169472029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84736010 + 84736011.

It is an arithmetic number, because the mean of its divisors is an integer number (84736011).

Almost surely, 2^169472021 is an apocalyptic number.

It is an amenable number.

169472021 is a deficient number, since it is larger than the sum of its proper divisors (1).

169472021 is an equidigital number, since it uses as much as digits as its factorization.

169472021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 169472021 is about 13018.1419949239. The cubic root of 169472021 is about 553.3917361864.

The spelling of 169472021 in words is "one hundred sixty-nine million, four hundred seventy-two thousand, twenty-one".