1421643523 has 2 divisors, whose sum is σ = 1421643524. Its totient is φ = 1421643522.

The previous prime is 1421643521. The next prime is 1421643583. The reversal of 1421643523 is 3253461241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1421643523 - 2¹ = 1421643521 is a prime.

Together with 1421643521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1421643521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710821761 + 710821762.

It is an arithmetic number, because the mean of its divisors is an integer number (710821762).

Almost surely, 2^1421643523 is an apocalyptic number.

1421643523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421643523 is an equidigital number, since it uses as much as digits as its factorization.

1421643523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 1421643523 is about 37704.6883424330. The cubic root of 1421643523 is about 1124.4243370553.

The spelling of 1421643523 in words is "one billion, four hundred twenty-one million, six hundred forty-three thousand, five hundred twenty-three".