1621436447 has 2 divisors, whose sum is σ = 1621436448. Its totient is φ = 1621436446.

The previous prime is 1621436441. The next prime is 1621436491. The reversal of 1621436447 is 7446341261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1621436447 - 2²⁶ = 1554327583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1621436447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621436441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810718223 + 810718224.

It is an arithmetic number, because the mean of its divisors is an integer number (810718224).

Almost surely, 2^1621436447 is an apocalyptic number.

1621436447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621436447 is an equidigital number, since it uses as much as digits as its factorization.

1621436447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 38.

The square root of 1621436447 is about 40267.0640474321. The cubic root of 1621436447 is about 1174.8073194239.

The spelling of 1621436447 in words is "one billion, six hundred twenty-one million, four hundred thirty-six thousand, four hundred forty-seven".