331320401 has 4 divisors (see below), whose sum is σ = 331501632. Its totient is φ = 331139172.

The previous prime is 331320349. The next prime is 331320403. The reversal of 331320401 is 104023133.

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: 104023133 = 2617 ⋅39749.

It is a cyclic number.

It is not a de Polignac number, because 331320401 - 2¹⁸ = 331058257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331320401.

It is not an unprimeable number, because it can be changed into a prime (331320403) 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, 87845 + ... + 91538.

It is an arithmetic number, because the mean of its divisors is an integer number (82875408).

Almost surely, 2^331320401 is an apocalyptic number.

It is an amenable number.

331320401 is a deficient number, since it is larger than the sum of its proper divisors (181231).

331320401 is a wasteful number, since it uses less digits than its factorization.

331320401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181230.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 331320401 is about 18202.2086846624. The cubic root of 331320401 is about 691.9627661312.

Adding to 331320401 its reverse (104023133), we get a palindrome (435343534).

The spelling of 331320401 in words is "three hundred thirty-one million, three hundred twenty thousand, four hundred one".