421165631 has 4 divisors (see below), whose sum is σ = 421430952. Its totient is φ = 420900312.

The previous prime is 421165583. The next prime is 421165649. The reversal of 421165631 is 136561124.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 421165631 - 2¹⁴ = 421149247 is a prime.

It is a super-2 number, since 2×421165631² = 354760977471256322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421165594 and 421165603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421165831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130265 + ... + 133458.

It is an arithmetic number, because the mean of its divisors is an integer number (105357738).

Almost surely, 2^421165631 is an apocalyptic number.

421165631 is a deficient number, since it is larger than the sum of its proper divisors (265321).

421165631 is a wasteful number, since it uses less digits than its factorization.

421165631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265320.

The product of its digits is 4320, while the sum is 29.

The square root of 421165631 is about 20522.3203122844. The cubic root of 421165631 is about 749.5793973538.

The spelling of 421165631 in words is "four hundred twenty-one million, one hundred sixty-five thousand, six hundred thirty-one".