421451617 has 4 divisors (see below), whose sum is σ = 422089876. Its totient is φ = 420813360.

The previous prime is 421451561. The next prime is 421451621. The reversal of 421451617 is 716154124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229795281 + 191656336 = 15159^2 + 13844^2 .

It is a cyclic number.

It is not a de Polignac number, because 421451617 - 2¹¹ = 421449569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421451677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318138 + ... + 319459.

It is an arithmetic number, because the mean of its divisors is an integer number (105522469).

Almost surely, 2^421451617 is an apocalyptic number.

It is an amenable number.

421451617 is a deficient number, since it is larger than the sum of its proper divisors (638259).

421451617 is an equidigital number, since it uses as much as digits as its factorization.

421451617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638258.

The product of its digits is 6720, while the sum is 31.

The square root of 421451617 is about 20529.2868117721. The cubic root of 421451617 is about 749.7490223934.

The spelling of 421451617 in words is "four hundred twenty-one million, four hundred fifty-one thousand, six hundred seventeen".