61423521 has 4 divisors (see below), whose sum is σ = 81898032. Its totient is φ = 40949012.

The previous prime is 61423519. The next prime is 61423529. The reversal of 61423521 is 12532416.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61423521 - 2¹ = 61423519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61423491 and 61423500.

It is not an unprimeable number, because it can be changed into a prime (61423529) 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, 10237251 + ... + 10237256.

It is an arithmetic number, because the mean of its divisors is an integer number (20474508).

Almost surely, 2^61423521 is an apocalyptic number.

It is an amenable number.

61423521 is a deficient number, since it is larger than the sum of its proper divisors (20474511).

61423521 is a wasteful number, since it uses less digits than its factorization.

61423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20474510.

The product of its digits is 1440, while the sum is 24.

The square root of 61423521 is about 7837.3159308529. The cubic root of 61423521 is about 394.5586503453.

Adding to 61423521 its reverse (12532416), we get a palindrome (73955937).

The spelling of 61423521 in words is "sixty-one million, four hundred twenty-three thousand, five hundred twenty-one".