1631543 has 2 divisors, whose sum is σ = 1631544. Its totient is φ = 1631542.

The previous prime is 1631537. The next prime is 1631557. The reversal of 1631543 is 3451361.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1631543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815771 + 815772.

It is an arithmetic number, because the mean of its divisors is an integer number (815772).

2^1631543 is an apocalyptic number.

1631543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631543 is an equidigital number, since it uses as much as digits as its factorization.

1631543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 23.

The square root of 1631543 is about 1277.3186759771. The cubic root of 1631543 is about 117.7243157212.

The spelling of 1631543 in words is "one million, six hundred thirty-one thousand, five hundred forty-three".