331690243 has 2 divisors, whose sum is σ = 331690244. Its totient is φ = 331690242.

The previous prime is 331690217. The next prime is 331690259. The reversal of 331690243 is 342096133.

It is a strong prime.

It is an emirp because it is prime and its reverse (342096133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331690243 - 2⁵ = 331690211 is a prime.

It is a super-2 number, since 2×331690243² = 220036834602798098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331690643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165845121 + 165845122.

It is an arithmetic number, because the mean of its divisors is an integer number (165845122).

Almost surely, 2^331690243 is an apocalyptic number.

331690243 is a deficient number, since it is larger than the sum of its proper divisors (1).

331690243 is an equidigital number, since it uses as much as digits as its factorization.

331690243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 331690243 is about 18212.3651127469. The cubic root of 331690243 is about 692.2201421010.

The spelling of 331690243 in words is "three hundred thirty-one million, six hundred ninety thousand, two hundred forty-three".