61123505 has 4 divisors (see below), whose sum is σ = 73348212. Its totient is φ = 48898800.

The previous prime is 61123501. The next prime is 61123507. The reversal of 61123505 is 50532116.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42941809 + 18181696 = 6553^2 + 4264^2 .

It is not a de Polignac number, because 61123505 - 2² = 61123501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61123501) 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, 6112346 + ... + 6112355.

It is an arithmetic number, because the mean of its divisors is an integer number (18337053).

Almost surely, 2^61123505 is an apocalyptic number.

It is an amenable number.

61123505 is a deficient number, since it is larger than the sum of its proper divisors (12224707).

61123505 is a wasteful number, since it uses less digits than its factorization.

61123505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12224706.

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

The square root of 61123505 is about 7818.1522753142. The cubic root of 61123505 is about 393.9152097511.

The spelling of 61123505 in words is "sixty-one million, one hundred twenty-three thousand, five hundred five".