401531 has 8 divisors (see below), whose sum is σ = 439824. Its totient is φ = 364320.

The previous prime is 401519. The next prime is 401537. The reversal of 401531 is 135104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401531 - 2¹⁸ = 139387 is a prime.

It is a super-2 number, since 2×401531² = 322454287922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 1101.

It is an arithmetic number, because the mean of its divisors is an integer number (54978).

2⁴⁰¹⁵³¹ is an apocalyptic number.

401531 is a deficient number, since it is larger than the sum of its proper divisors (38293).

401531 is a wasteful number, since it uses less digits than its factorization.

401531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 401531 is about 633.6647378543. The cubic root of 401531 is about 73.7745144972.

Adding to 401531 its reverse (135104), we get a palindrome (536635).

The spelling of 401531 in words is "four hundred one thousand, five hundred thirty-one".