1421647813 has 2 divisors, whose sum is σ = 1421647814. Its totient is φ = 1421647812.

The previous prime is 1421647793. The next prime is 1421647823. The reversal of 1421647813 is 3187461241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753063364 + 668584449 = 27442^2 + 25857^2 .

It is an emirp because it is prime and its reverse (3187461241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1421647813 - 2¹⁷ = 1421516741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421647823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710823906 + 710823907.

It is an arithmetic number, because the mean of its divisors is an integer number (710823907).

Almost surely, 2^1421647813 is an apocalyptic number.

It is an amenable number.

1421647813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421647813 is an equidigital number, since it uses as much as digits as its factorization.

1421647813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 1421647813 is about 37704.7452318670. The cubic root of 1421647813 is about 1124.4254680879.

The spelling of 1421647813 in words is "one billion, four hundred twenty-one million, six hundred forty-seven thousand, eight hundred thirteen".