1421806531 has 4 divisors (see below), whose sum is σ = 1443027592. Its totient is φ = 1400585472.

The previous prime is 1421806471. The next prime is 1421806553. The reversal of 1421806531 is 1356081241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1356081241 = 5689 ⋅238369.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421806531 is a prime.

It is a super-2 number, since 2×1421806531² = 4043067623188507922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421806493 and 1421806502.

It is not an unprimeable number, because it can be changed into a prime (1421800531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10610430 + ... + 10610563.

It is an arithmetic number, because the mean of its divisors is an integer number (360756898).

Almost surely, 2^1421806531 is an apocalyptic number.

1421806531 is a deficient number, since it is larger than the sum of its proper divisors (21221061).

1421806531 is an equidigital number, since it uses as much as digits as its factorization.

1421806531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21221060.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1421806531 is about 37706.8499214665. The cubic root of 1421806531 is about 1124.4673115315.

Adding to 1421806531 its reverse (1356081241), we get a palindrome (2777887772).

The spelling of 1421806531 in words is "one billion, four hundred twenty-one million, eight hundred six thousand, five hundred thirty-one".