401002031 has 4 divisors (see below), whose sum is σ = 401333832. Its totient is φ = 400670232.

The previous prime is 401002027. The next prime is 401002037. The reversal of 401002031 is 130200104.

It is a happy number.

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 401002031 - 2² = 401002027 is a prime.

It is a super-2 number, since 2×401002031² = 321605257732249922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401002037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164081 + ... + 166506.

It is an arithmetic number, because the mean of its divisors is an integer number (100333458).

Almost surely, 2^401002031 is an apocalyptic number.

401002031 is a deficient number, since it is larger than the sum of its proper divisors (331801).

401002031 is a wasteful number, since it uses less digits than its factorization.

401002031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331800.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 401002031 is about 20025.0351060866. The cubic root of 401002031 is about 737.4210389848.

Adding to 401002031 its reverse (130200104), we get a palindrome (531202135).

The spelling of 401002031 in words is "four hundred one million, two thousand, thirty-one".