421616531 has 12 divisors (see below), whose sum is σ = 497363760. Its totient is φ = 356292720.

The previous prime is 421616527. The next prime is 421616539. The reversal of 421616531 is 135616124.

It is a happy number.

It is not a de Polignac number, because 421616531 - 2² = 421616527 is a prime.

It is a super-2 number, since 2×421616531² = 355520998424947922, 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 = 421616494 and 421616503.

It is not an unprimeable number, because it can be changed into a prime (421616539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57116 + ... + 64073.

It is an arithmetic number, because the mean of its divisors is an integer number (41446980).

Almost surely, 2^421616531 is an apocalyptic number.

421616531 is a deficient number, since it is larger than the sum of its proper divisors (75747229).

421616531 is a wasteful number, since it uses less digits than its factorization.

421616531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121274 (or 121267 counting only the distinct ones).

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

The square root of 421616531 is about 20533.3029734624. The cubic root of 421616531 is about 749.8468018944.

The spelling of 421616531 in words is "four hundred twenty-one million, six hundred sixteen thousand, five hundred thirty-one".