421645391149 has 2 divisors, whose sum is σ = 421645391150. Its totient is φ = 421645391148.

The previous prime is 421645391137. The next prime is 421645391213. The reversal of 421645391149 is 941193546124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310611155625 + 111034235524 = 557325^2 + 333218^2 .

It is a cyclic number.

It is not a de Polignac number, because 421645391149 - 2¹¹ = 421645389101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421645391119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210822695574 + 210822695575.

It is an arithmetic number, because the mean of its divisors is an integer number (210822695575).

Almost surely, 2^421645391149 is an apocalyptic number.

It is an amenable number.

421645391149 is a deficient number, since it is larger than the sum of its proper divisors (1).

421645391149 is an equidigital number, since it uses as much as digits as its factorization.

421645391149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 49.

The spelling of 421645391149 in words is "four hundred twenty-one billion, six hundred forty-five million, three hundred ninety-one thousand, one hundred forty-nine".