61505123 has 4 divisors (see below), whose sum is σ = 61552800. Its totient is φ = 61457448.

The previous prime is 61505113. The next prime is 61505131. The reversal of 61505123 is 32150516.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61505123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61505113) 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, 21848 + ... + 24501.

It is an arithmetic number, because the mean of its divisors is an integer number (15388200).

Almost surely, 2^61505123 is an apocalyptic number.

61505123 is a deficient number, since it is larger than the sum of its proper divisors (47677).

61505123 is a wasteful number, since it uses less digits than its factorization.

61505123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47676.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 61505123 is about 7842.5201944273. The cubic root of 61505123 is about 394.7332985747.

Adding to 61505123 its reverse (32150516), we get a palindrome (93655639).

The spelling of 61505123 in words is "sixty-one million, five hundred five thousand, one hundred twenty-three".