3169721 has 2 divisors, whose sum is σ = 3169722. Its totient is φ = 3169720.

The previous prime is 3169697. The next prime is 3169723. The reversal of 3169721 is 1279613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 156025 = 1736^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 3169721 - 2¹⁸ = 2907577 is a prime.

Together with 3169723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3169723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1584860 + 1584861.

It is an arithmetic number, because the mean of its divisors is an integer number (1584861).

Almost surely, 2^3169721 is an apocalyptic number.

It is an amenable number.

3169721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3169721 is an equidigital number, since it uses as much as digits as its factorization.

3169721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 3169721 is about 1780.3710287465. The cubic root of 3169721 is about 146.8949996004.

The spelling of 3169721 in words is "three million, one hundred sixty-nine thousand, seven hundred twenty-one".