1631243 has 2 divisors, whose sum is σ = 1631244. Its totient is φ = 1631242.

The previous prime is 1631209. The next prime is 1631257. The reversal of 1631243 is 3421361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1631243 - 2⁸ = 1630987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1631263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815621 + 815622.

It is an arithmetic number, because the mean of its divisors is an integer number (815622).

2^1631243 is an apocalyptic number.

1631243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631243 is an equidigital number, since it uses as much as digits as its factorization.

1631243 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1631243 is about 1277.2012370805. The cubic root of 1631243 is about 117.7170997587.

The spelling of 1631243 in words is "one million, six hundred thirty-one thousand, two hundred forty-three".