331978201 has 2 divisors, whose sum is σ = 331978202. Its totient is φ = 331978200.

The previous prime is 331978187. The next prime is 331978211. The reversal of 331978201 is 102879133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331968400 + 9801 = 18220^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 331978201 - 2¹⁷ = 331847129 is a prime.

It is a super-2 number, since 2×331978201² = 220419051878392802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331978211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165989100 + 165989101.

It is an arithmetic number, because the mean of its divisors is an integer number (165989101).

Almost surely, 2^331978201 is an apocalyptic number.

It is an amenable number.

331978201 is a deficient number, since it is larger than the sum of its proper divisors (1).

331978201 is an equidigital number, since it uses as much as digits as its factorization.

331978201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 331978201 is about 18220.2689606932. The cubic root of 331978201 is about 692.4204019082.

The spelling of 331978201 in words is "three hundred thirty-one million, nine hundred seventy-eight thousand, two hundred one".