1573491 has 4 divisors (see below), whose sum is σ = 2097992. Its totient is φ = 1048992.

The previous prime is 1573487. The next prime is 1573501. The reversal of 1573491 is 1943751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1943751 = 3 ⋅647917.

It is not a de Polignac number, because 1573491 - 2² = 1573487 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1573391) 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, 262246 + ... + 262251.

It is an arithmetic number, because the mean of its divisors is an integer number (524498).

2^1573491 is an apocalyptic number.

1573491 is a deficient number, since it is larger than the sum of its proper divisors (524501).

1573491 is an equidigital number, since it uses as much as digits as its factorization.

1573491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524500.

The product of its digits is 3780, while the sum is 30.

The square root of 1573491 is about 1254.3886957399. The cubic root of 1573491 is about 116.3111691030.

The spelling of 1573491 in words is "one million, five hundred seventy-three thousand, four hundred ninety-one".