421165601 has 4 divisors (see below), whose sum is σ = 422511492. Its totient is φ = 419819712.

The previous prime is 421165583. The next prime is 421165649. The reversal of 421165601 is 106561124.

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 36966400 + 384199201 = 6080^2 + 19601^2 .

It is a cyclic number.

It is not a de Polignac number, because 421165601 - 2¹⁰ = 421164577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421165201) 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 in 3 ways as a sum of consecutive naturals, for example, 672476 + ... + 673101.

It is an arithmetic number, because the mean of its divisors is an integer number (105627873).

Almost surely, 2^421165601 is an apocalyptic number.

It is an amenable number.

421165601 is a deficient number, since it is larger than the sum of its proper divisors (1345891).

421165601 is a wasteful number, since it uses less digits than its factorization.

421165601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345890.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 421165601 is about 20522.3195813729. The cubic root of 421165601 is about 749.5793795561.

The spelling of 421165601 in words is "four hundred twenty-one million, one hundred sixty-five thousand, six hundred one".