1543631 has 2 divisors, whose sum is σ = 1543632. Its totient is φ = 1543630.

The previous prime is 1543589. The next prime is 1543637. The reversal of 1543631 is 1363451.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1543631 - 2¹⁴ = 1527247 is a prime.

It is a super-2 number, since 2×1543631² = 4765593328322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1543597 and 1543606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1543637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771815 + 771816.

It is an arithmetic number, because the mean of its divisors is an integer number (771816).

2^1543631 is an apocalyptic number.

1543631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543631 is an equidigital number, since it uses as much as digits as its factorization.

1543631 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 1543631 is about 1242.4294748596. The cubic root of 1543631 is about 115.5707231008.

The spelling of 1543631 in words is "one million, five hundred forty-three thousand, six hundred thirty-one".