331997849 has 4 divisors (see below), whose sum is σ = 349471440. Its totient is φ = 314524260.

The previous prime is 331997843. The next prime is 331997867. The reversal of 331997849 is 948799133.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 948799133 = 10429 ⋅90977.

It is a cyclic number.

It is not a de Polignac number, because 331997849 - 2⁴ = 331997833 is a prime.

It is a super-2 number, since 2×331997849² = 220445143481253602, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 331997849.

It is not an unprimeable number, because it can be changed into a prime (331997843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8736767 + ... + 8736804.

It is an arithmetic number, because the mean of its divisors is an integer number (87367860).

Almost surely, 2^331997849 is an apocalyptic number.

It is an amenable number.

331997849 is a deficient number, since it is larger than the sum of its proper divisors (17473591).

331997849 is a wasteful number, since it uses less digits than its factorization.

331997849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17473590.

The product of its digits is 1469664, while the sum is 53.

The square root of 331997849 is about 18220.8081324622. The cubic root of 331997849 is about 692.4340618489.

The spelling of 331997849 in words is "three hundred thirty-one million, nine hundred ninety-seven thousand, eight hundred forty-nine".