331722001 has 16 divisors (see below), whose sum is σ = 363673296. Its totient is φ = 300727296.

The previous prime is 331721993. The next prime is 331722019. The reversal of 331722001 is 100227133.

It can be written as a sum of positive squares in 8 ways, for example, as 4835601 + 326886400 = 2199^2 + 18080^2 .

It is not a de Polignac number, because 331722001 - 2³ = 331721993 is a prime.

It is a super-2 number, since 2×331722001² = 220078971894888002, which contains 22 as substring.

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 331722001.

It is not an unprimeable number, because it can be changed into a prime (331722101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277461 + ... + 278653.

It is an arithmetic number, because the mean of its divisors is an integer number (22729581).

Almost surely, 2^331722001 is an apocalyptic number.

It is an amenable number.

331722001 is a deficient number, since it is larger than the sum of its proper divisors (31951295).

331722001 is a wasteful number, since it uses less digits than its factorization.

331722001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 331722001 is about 18213.2369720487. The cubic root of 331722001 is about 692.2422338227.

Adding to 331722001 its reverse (100227133), we get a palindrome (431949134).

The spelling of 331722001 in words is "three hundred thirty-one million, seven hundred twenty-two thousand, one".