492721 has 2 divisors, whose sum is σ = 492722. Its totient is φ = 492720.

The previous prime is 492719. The next prime is 492731. The reversal of 492721 is 127294.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435600 + 57121 = 660^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 492721 - 2¹ = 492719 is a prime.

Together with 492719, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (492731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246360 + 246361.

It is an arithmetic number, because the mean of its divisors is an integer number (246361).

2⁴⁹²⁷²¹ is an apocalyptic number.

It is an amenable number.

492721 is a deficient number, since it is larger than the sum of its proper divisors (1).

492721 is an equidigital number, since it uses as much as digits as its factorization.

492721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 492721 is about 701.9408807015. The cubic root of 492721 is about 78.9830118895.

The spelling of 492721 in words is "four hundred ninety-two thousand, seven hundred twenty-one".