1631143 has 2 divisors, whose sum is σ = 1631144. Its totient is φ = 1631142.

The previous prime is 1631117. The next prime is 1631153. The reversal of 1631143 is 3411361.

It is a strong prime.

It is an emirp because it is prime and its reverse (3411361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1631143 - 2¹⁷ = 1500071 is a prime.

1631143 is a lucky number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1631143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815571 + 815572.

It is an arithmetic number, because the mean of its divisors is an integer number (815572).

2^1631143 is an apocalyptic number.

1631143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631143 is an equidigital number, since it uses as much as digits as its factorization.

1631143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 1631143 is about 1277.1620883819. The cubic root of 1631143 is about 117.7146942412.

The spelling of 1631143 in words is "one million, six hundred thirty-one thousand, one hundred forty-three".