1531421 has 4 divisors (see below), whose sum is σ = 1537344. Its totient is φ = 1525500.

The previous prime is 1531379. The next prime is 1531447. The reversal of 1531421 is 1241351.

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.

It is a cyclic number.

It is not a de Polignac number, because 1531421 - 2⁶ = 1531357 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 1531421.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2555 + ... + 3096.

It is an arithmetic number, because the mean of its divisors is an integer number (384336).

2^1531421 is an apocalyptic number.

It is an amenable number.

1531421 is a deficient number, since it is larger than the sum of its proper divisors (5923).

1531421 is an equidigital number, since it uses as much as digits as its factorization.

1531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922.

The product of its digits is 120, while the sum is 17.

The square root of 1531421 is about 1237.5059595816. The cubic root of 1531421 is about 115.2651976702.

Adding to 1531421 its reverse (1241351), we get a palindrome (2772772).

The spelling of 1531421 in words is "one million, five hundred thirty-one thousand, four hundred twenty-one".