406631 has 2 divisors, whose sum is σ = 406632. Its totient is φ = 406630.

The previous prime is 406591. The next prime is 406633. The reversal of 406631 is 136604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406631 - 2¹⁰ = 405607 is a prime.

It is a super-2 number, since 2×406631² = 330697540322, which contains 22 as substring.

Together with 406633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203315 + 203316.

It is an arithmetic number, because the mean of its divisors is an integer number (203316).

2⁴⁰⁶⁶³¹ is an apocalyptic number.

406631 is a deficient number, since it is larger than the sum of its proper divisors (1).

406631 is an equidigital number, since it uses as much as digits as its factorization.

406631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 406631 is about 637.6762501458. The cubic root of 406631 is about 74.0855475222.

The spelling of 406631 in words is "four hundred six thousand, six hundred thirty-one".