331432513 has 4 divisors (see below), whose sum is σ = 331579348. Its totient is φ = 331285680.

The previous prime is 331432511. The next prime is 331432567. The reversal of 331432513 is 315234133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315234133 = 31 ⋅10168843.

It can be written as a sum of positive squares in 2 ways, for example, as 231891984 + 99540529 = 15228^2 + 9977^2 .

It is a cyclic number.

It is not a de Polignac number, because 331432513 - 2¹ = 331432511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331432511) 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, 69978 + ... + 74563.

It is an arithmetic number, because the mean of its divisors is an integer number (82894837).

Almost surely, 2^331432513 is an apocalyptic number.

It is an amenable number.

331432513 is a deficient number, since it is larger than the sum of its proper divisors (146835).

331432513 is a wasteful number, since it uses less digits than its factorization.

331432513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146834.

The product of its digits is 3240, while the sum is 25.

The square root of 331432513 is about 18205.2880504539. The cubic root of 331432513 is about 692.0408059791.

Adding to 331432513 its reverse (315234133), we get a palindrome (646666646).

The spelling of 331432513 in words is "three hundred thirty-one million, four hundred thirty-two thousand, five hundred thirteen".