1531121 has 4 divisors (see below), whose sum is σ = 1580544. Its totient is φ = 1481700.

The previous prime is 1531111. The next prime is 1531129. The reversal of 1531121 is 1211351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1211351 = 211 ⋅5741.

It is a cyclic number.

It is not a de Polignac number, because 1531121 - 2¹⁰ = 1530097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1531096 and 1531105.

It is not an unprimeable number, because it can be changed into a prime (1531129) 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, 24665 + ... + 24726.

It is an arithmetic number, because the mean of its divisors is an integer number (395136).

2^1531121 is an apocalyptic number.

It is an amenable number.

1531121 is a deficient number, since it is larger than the sum of its proper divisors (49423).

1531121 is an equidigital number, since it uses as much as digits as its factorization.

1531121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49422.

The product of its digits is 30, while the sum is 14.

The square root of 1531121 is about 1237.3847421073. The cubic root of 1531121 is about 115.2576704961.

Adding to 1531121 its reverse (1211351), we get a palindrome (2742472).

The spelling of 1531121 in words is "one million, five hundred thirty-one thousand, one hundred twenty-one".