1421531 has 4 divisors (see below), whose sum is σ = 1425912. Its totient is φ = 1417152.

The previous prime is 1421527. The next prime is 1421543. The reversal of 1421531 is 1351241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1421531 - 2² = 1421527 is a prime.

It is a super-2 number, since 2×1421531² = 4041500767922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421501) 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, 1661 + ... + 2366.

It is an arithmetic number, because the mean of its divisors is an integer number (356478).

2^1421531 is an apocalyptic number.

1421531 is a deficient number, since it is larger than the sum of its proper divisors (4381).

1421531 is an equidigital number, since it uses as much as digits as its factorization.

1421531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380.

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

The square root of 1421531 is about 1192.2797490522. The cubic root of 1421531 is about 112.4394670233.

Adding to 1421531 its reverse (1351241), we get a palindrome (2772772).

The spelling of 1421531 in words is "one million, four hundred twenty-one thousand, five hundred thirty-one".