401533231 has 4 divisors (see below), whose sum is σ = 438036264. Its totient is φ = 365030200.

The previous prime is 401533207. The next prime is 401533259. The reversal of 401533231 is 132335104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401533231 - 2⁵ = 401533199 is a prime.

It is a super-2 number, since 2×401533231² = 322457871194598722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401533031) 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, 18251500 + ... + 18251521.

It is an arithmetic number, because the mean of its divisors is an integer number (109509066).

Almost surely, 2^401533231 is an apocalyptic number.

401533231 is a deficient number, since it is larger than the sum of its proper divisors (36503033).

401533231 is a wasteful number, since it uses less digits than its factorization.

401533231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36503032.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 401533231 is about 20038.2941140208. The cubic root of 401533231 is about 737.7465113312.

Adding to 401533231 its reverse (132335104), we get a palindrome (533868335).

The spelling of 401533231 in words is "four hundred one million, five hundred thirty-three thousand, two hundred thirty-one".