1531601 has 4 divisors (see below), whose sum is σ = 1548900. Its totient is φ = 1514304.

The previous prime is 1531591. The next prime is 1531619. The reversal of 1531601 is 1061351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1061351 = 59 ⋅17989.

It can be written as a sum of positive squares in 2 ways, for example, as 483025 + 1048576 = 695^2 + 1024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1531601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1531601.

It is not an unprimeable number, because it can be changed into a prime (1531631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8516 + ... + 8693.

It is an arithmetic number, because the mean of its divisors is an integer number (387225).

2^1531601 is an apocalyptic number.

It is an amenable number.

1531601 is a deficient number, since it is larger than the sum of its proper divisors (17299).

1531601 is an equidigital number, since it uses as much as digits as its factorization.

1531601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17298.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1531601 is about 1237.5786843672. The cubic root of 1531601 is about 115.2697135029.

Adding to 1531601 its reverse (1061351), we get a palindrome (2592952).

The spelling of 1531601 in words is "one million, five hundred thirty-one thousand, six hundred one".