61513173 has 6 divisors (see below), whose sum is σ = 88852374. Its totient is φ = 41008776.

The previous prime is 61513139. The next prime is 61513183. The reversal of 61513173 is 37131516.

It can be written as a sum of positive squares in only one way, i.e., 35319249 + 26193924 = 5943^2 + 5118^2 .

It is not a de Polignac number, because 61513173 - 2⁸ = 61512917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61513183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3417390 + ... + 3417407.

It is an arithmetic number, because the mean of its divisors is an integer number (14808729).

Almost surely, 2^61513173 is an apocalyptic number.

It is an amenable number.

61513173 is a deficient number, since it is larger than the sum of its proper divisors (27339201).

61513173 is a wasteful number, since it uses less digits than its factorization.

61513173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6834803 (or 6834800 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 61513173 is about 7843.0334055135. The cubic root of 61513173 is about 394.7505191696.

Adding to 61513173 its reverse (37131516), we get a palindrome (98644689).

The spelling of 61513173 in words is "sixty-one million, five hundred thirteen thousand, one hundred seventy-three".