331802397 has 6 divisors (see below), whose sum is σ = 479270142. Its totient is φ = 221201592.

The previous prime is 331802389. The next prime is 331802411. The reversal of 331802397 is 793208133.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 204089796 + 127712601 = 14286^2 + 11301^2 .

It is not a de Polignac number, because 331802397 - 2³ = 331802389 is a prime.

It is a super-2 number, since 2×331802397² = 220185661309891218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331802197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18433458 + ... + 18433475.

It is an arithmetic number, because the mean of its divisors is an integer number (79878357).

Almost surely, 2^331802397 is an apocalyptic number.

It is an amenable number.

331802397 is a deficient number, since it is larger than the sum of its proper divisors (147467745).

331802397 is a wasteful number, since it uses less digits than its factorization.

331802397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36866939 (or 36866936 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 331802397 is about 18215.4439144370. The cubic root of 331802397 is about 692.2981531478.

The spelling of 331802397 in words is "three hundred thirty-one million, eight hundred two thousand, three hundred ninety-seven".