61542123 has 4 divisors (see below), whose sum is σ = 82056168. Its totient is φ = 41028080.

The previous prime is 61542119. The next prime is 61542149. The reversal of 61542123 is 32124516.

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 61542123 - 2² = 61542119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61542093 and 61542102.

It is not an unprimeable number, because it can be changed into a prime (61542323) 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, 10257018 + ... + 10257023.

It is an arithmetic number, because the mean of its divisors is an integer number (20514042).

Almost surely, 2^61542123 is an apocalyptic number.

61542123 is a deficient number, since it is larger than the sum of its proper divisors (20514045).

61542123 is a wasteful number, since it uses less digits than its factorization.

61542123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20514044.

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

The square root of 61542123 is about 7844.8787753540. The cubic root of 61542123 is about 394.8124367213.

Adding to 61542123 its reverse (32124516), we get a palindrome (93666639).

The spelling of 61542123 in words is "sixty-one million, five hundred forty-two thousand, one hundred twenty-three".