1531723 has 6 divisors (see below), whose sum is σ = 1616964. Its totient is φ = 1450764.

The previous prime is 1531721. The next prime is 1531729. The reversal of 1531723 is 3271351.

It is not a de Polignac number, because 1531723 - 2¹ = 1531721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1531694 and 1531703.

It is not an unprimeable number, because it can be changed into a prime (1531721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1761 + ... + 2482.

It is an arithmetic number, because the mean of its divisors is an integer number (269494).

2^1531723 is an apocalyptic number.

1531723 is a deficient number, since it is larger than the sum of its proper divisors (85241).

1531723 is an equidigital number, since it uses as much as digits as its factorization.

1531723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4281 (or 4262 counting only the distinct ones).

The product of its digits is 630, while the sum is 22.

The square root of 1531723 is about 1237.6279731810. The cubic root of 1531723 is about 115.2727740327.

The spelling of 1531723 in words is "one million, five hundred thirty-one thousand, seven hundred twenty-three".