426531 has 16 divisors (see below), whose sum is σ = 684800. Its totient is φ = 230688.

The previous prime is 426527. The next prime is 426541. The reversal of 426531 is 135624.

426531 = 168² + 169² + ... + 181².

It is a happy number.

It is not a de Polignac number, because 426531 - 2² = 426527 is a prime.

It is a super-2 number, since 2×426531² = 363857387922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 426498 and 426507.

It is not an unprimeable number, because it can be changed into a prime (426541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136 + ... + 933.

It is an arithmetic number, because the mean of its divisors is an integer number (42800).

2⁴²⁶⁵³¹ is an apocalyptic number.

426531 is a deficient number, since it is larger than the sum of its proper divisors (258269).

426531 is a wasteful number, since it uses less digits than its factorization.

426531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098.

The product of its digits is 720, while the sum is 21.

The square root of 426531 is about 653.0934083269. The cubic root of 426531 is about 75.2749022633.

The spelling of 426531 in words is "four hundred twenty-six thousand, five hundred thirty-one".