1531001 has 6 divisors (see below), whose sum is σ = 1616202. Its totient is φ = 1450080.

The previous prime is 1530967. The next prime is 1531021. The reversal of 1531001 is 1001351.

It can be written as a sum of positive squares in only one way, i.e., 1525225 + 5776 = 1235^2 + 76^2 .

It is not a de Polignac number, because 1531001 - 2⁶ = 1530937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1531021) 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 5 ways as a sum of consecutive naturals, for example, 1760 + ... + 2481.

It is an arithmetic number, because the mean of its divisors is an integer number (269367).

2^1531001 is an apocalyptic number.

It is an amenable number.

1531001 is a deficient number, since it is larger than the sum of its proper divisors (85201).

1531001 is an equidigital number, since it uses as much as digits as its factorization.

1531001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279 (or 4260 counting only the distinct ones).

The product of its (nonzero) digits is 15, while the sum is 11.

The square root of 1531001 is about 1237.3362517925. The cubic root of 1531001 is about 115.2546593512.

Adding to 1531001 its reverse (1001351), we get a palindrome (2532352).

The spelling of 1531001 in words is "one million, five hundred thirty-one thousand, one".