1431546421 has 4 divisors (see below), whose sum is σ = 1515755052. Its totient is φ = 1347337792.

The previous prime is 1431546407. The next prime is 1431546451. The reversal of 1431546421 is 1246451341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1246451341 = 521 ⋅2392421.

It can be written as a sum of positive squares in 2 ways, for example, as 1314062500 + 117483921 = 36250^2 + 10839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1431546421 - 2⁹ = 1431545909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431546451) 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, 42104290 + ... + 42104323.

It is an arithmetic number, because the mean of its divisors is an integer number (378938763).

Almost surely, 2^1431546421 is an apocalyptic number.

It is an amenable number.

1431546421 is a deficient number, since it is larger than the sum of its proper divisors (84208631).

1431546421 is an equidigital number, since it uses as much as digits as its factorization.

1431546421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84208630.

The product of its digits is 11520, while the sum is 31.

The square root of 1431546421 is about 37835.7822834417. The cubic root of 1431546421 is about 1127.0291401186.

Adding to 1431546421 its reverse (1246451341), we get a palindrome (2677997762).

The spelling of 1431546421 in words is "one billion, four hundred thirty-one million, five hundred forty-six thousand, four hundred twenty-one".