421512523 has 4 divisors (see below), whose sum is σ = 422763640. Its totient is φ = 420261408.

The previous prime is 421512521. The next prime is 421512527. The reversal of 421512523 is 325215124.

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 421512523 - 2¹ = 421512521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421512521) 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, 625053 + ... + 625726.

It is an arithmetic number, because the mean of its divisors is an integer number (105690910).

Almost surely, 2^421512523 is an apocalyptic number.

421512523 is a deficient number, since it is larger than the sum of its proper divisors (1251117).

421512523 is a wasteful number, since it uses less digits than its factorization.

421512523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251116.

The product of its digits is 2400, while the sum is 25.

The square root of 421512523 is about 20530.7701511658. The cubic root of 421512523 is about 749.7851372660.

Adding to 421512523 its reverse (325215124), we get a palindrome (746727647).

The spelling of 421512523 in words is "four hundred twenty-one million, five hundred twelve thousand, five hundred twenty-three".