331897817 has 8 divisors (see below), whose sum is σ = 354902472. Its totient is φ = 309280000.

The previous prime is 331897777. The next prime is 331897859. The reversal of 331897817 is 718798133.

It can be written as a sum of positive squares in 4 ways, for example, as 73685056 + 258212761 = 8584^2 + 16069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 331897817 - 2¹⁸ = 331635673 is a prime.

It is a super-2 number, since 2×331897817² = 220312321858730978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (331897877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94934 + ... + 98367.

It is an arithmetic number, because the mean of its divisors is an integer number (44362809).

Almost surely, 2^331897817 is an apocalyptic number.

It is an amenable number.

331897817 is a deficient number, since it is larger than the sum of its proper divisors (23004655).

331897817 is a wasteful number, since it uses less digits than its factorization.

331897817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193419.

The product of its digits is 254016, while the sum is 47.

The square root of 331897817 is about 18218.0629321561. The cubic root of 331897817 is about 692.3645106735.

The spelling of 331897817 in words is "three hundred thirty-one million, eight hundred ninety-seven thousand, eight hundred seventeen".