1531943 has 4 divisors (see below), whose sum is σ = 1750800. Its totient is φ = 1313088.

The previous prime is 1531909. The next prime is 1531987. The reversal of 1531943 is 3491351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3491351 = 269 ⋅12979.

It is not a de Polignac number, because 1531943 - 2¹⁶ = 1466407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109418 + ... + 109431.

It is an arithmetic number, because the mean of its divisors is an integer number (437700).

2^1531943 is an apocalyptic number.

1531943 is a deficient number, since it is larger than the sum of its proper divisors (218857).

1531943 is an equidigital number, since it uses as much as digits as its factorization.

1531943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218856.

The product of its digits is 1620, while the sum is 26.

The square root of 1531943 is about 1237.7168496874. The cubic root of 1531943 is about 115.2782926102.

The spelling of 1531943 in words is "one million, five hundred thirty-one thousand, nine hundred forty-three".