331049947 has 2 divisors, whose sum is σ = 331049948. Its totient is φ = 331049946.

The previous prime is 331049923. The next prime is 331049987. The reversal of 331049947 is 749940133.

It is a happy number.

It is an a-pointer prime, because the next prime (331049987) can be obtained adding 331049947 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (749940133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331049947 - 2¹⁵ = 331017179 is a prime.

It is a super-3 number, since 3×331049947³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (331049987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165524973 + 165524974.

It is an arithmetic number, because the mean of its divisors is an integer number (165524974).

Almost surely, 2^331049947 is an apocalyptic number.

331049947 is a deficient number, since it is larger than the sum of its proper divisors (1).

331049947 is an equidigital number, since it uses as much as digits as its factorization.

331049947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 331049947 is about 18194.7780145843. The cubic root of 331049947 is about 691.7744337880.

The spelling of 331049947 in words is "three hundred thirty-one million, forty-nine thousand, nine hundred forty-seven".