3201221957 has 2 divisors, whose sum is σ = 3201221958. Its totient is φ = 3201221956.

The previous prime is 3201221953. The next prime is 3201221977. The reversal of 3201221957 is 7591221023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2519437636 + 681784321 = 50194^2 + 26111^2 .

It is a cyclic number.

It is not a de Polignac number, because 3201221957 - 2² = 3201221953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3201221951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1600610978 + 1600610979.

It is an arithmetic number, because the mean of its divisors is an integer number (1600610979).

Almost surely, 2^3201221957 is an apocalyptic number.

It is an amenable number.

3201221957 is a deficient number, since it is larger than the sum of its proper divisors (1).

3201221957 is an equidigital number, since it uses as much as digits as its factorization.

3201221957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 3201221957 is about 56579.3421400426. The cubic root of 3201221957 is about 1473.8001475890.

The spelling of 3201221957 in words is "three billion, two hundred one million, two hundred twenty-one thousand, nine hundred fifty-seven".