401331023 has 4 divisors (see below), whose sum is σ = 401431680. Its totient is φ = 401230368.

The previous prime is 401331013. The next prime is 401331031. The reversal of 401331023 is 320133104.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401331023 is a prime.

It is a super-2 number, since 2×401331023² = 322133180044453058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401330992 and 401331010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401331013) 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, 44090 + ... + 52407.

It is an arithmetic number, because the mean of its divisors is an integer number (100357920).

Almost surely, 2^401331023 is an apocalyptic number.

401331023 is a deficient number, since it is larger than the sum of its proper divisors (100657).

401331023 is an equidigital number, since it uses as much as digits as its factorization.

401331023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100656.

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

The square root of 401331023 is about 20033.2479393632. The cubic root of 401331023 is about 737.6226500219.

Adding to 401331023 its reverse (320133104), we get a palindrome (721464127).

The spelling of 401331023 in words is "four hundred one million, three hundred thirty-one thousand, twenty-three".