426661 has 2 divisors, whose sum is σ = 426662. Its totient is φ = 426660.

The previous prime is 426641. The next prime is 426691. The reversal of 426661 is 166624.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 101761 = 570^2 + 319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426661 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213330 + 213331.

It is an arithmetic number, because the mean of its divisors is an integer number (213331).

2⁴²⁶⁶⁶¹ is an apocalyptic number.

It is an amenable number.

426661 is a deficient number, since it is larger than the sum of its proper divisors (1).

426661 is an equidigital number, since it uses as much as digits as its factorization.

426661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 426661 is about 653.1929270897. The cubic root of 426661 is about 75.2825490254.

The spelling of 426661 in words is "four hundred twenty-six thousand, six hundred sixty-one".