402531 has 4 divisors (see below), whose sum is σ = 536712. Its totient is φ = 268352.

The previous prime is 402529. The next prime is 402541. The reversal of 402531 is 135204.

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 402531 - 2¹ = 402529 is a prime.

It is a super-2 number, since 2×402531² = 324062411922, which contains 22 as substring.

It is a D-number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 402531.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 402531.

It is not an unprimeable number, because it can be changed into a prime (402511) 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, 67086 + ... + 67091.

It is an arithmetic number, because the mean of its divisors is an integer number (134178).

2⁴⁰²⁵³¹ is an apocalyptic number.

402531 is a deficient number, since it is larger than the sum of its proper divisors (134181).

402531 is a wasteful number, since it uses less digits than its factorization.

402531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134180.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 402531 is about 634.4533079747. The cubic root of 402531 is about 73.8357080744.

Adding to 402531 its reverse (135204), we get a palindrome (537735).

The spelling of 402531 in words is "four hundred two thousand, five hundred thirty-one".