421455985409 has 2 divisors, whose sum is σ = 421455985410. Its totient is φ = 421455985408.

The previous prime is 421455985397. The next prime is 421455985427. The reversal of 421455985409 is 904589554124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401326051009 + 20129934400 = 633503^2 + 141880^2 .

It is a cyclic number.

It is not a de Polignac number, because 421455985409 - 2⁴ = 421455985393 is a prime.

It is not a weakly prime, because it can be changed into another prime (421455985009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210727992704 + 210727992705.

It is an arithmetic number, because the mean of its divisors is an integer number (210727992705).

Almost surely, 2^421455985409 is an apocalyptic number.

It is an amenable number.

421455985409 is a deficient number, since it is larger than the sum of its proper divisors (1).

421455985409 is an equidigital number, since it uses as much as digits as its factorization.

421455985409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368000, while the sum is 56.

The spelling of 421455985409 in words is "four hundred twenty-one billion, four hundred fifty-five million, nine hundred eighty-five thousand, four hundred nine".