61155613 has 4 divisors (see below), whose sum is σ = 64753020. Its totient is φ = 57558208.

The previous prime is 61155599. The next prime is 61155617. The reversal of 61155613 is 31655116.

61155613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51308569 + 9847044 = 7163^2 + 3138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61155613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61155617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1798678 + ... + 1798711.

It is an arithmetic number, because the mean of its divisors is an integer number (16188255).

Almost surely, 2^61155613 is an apocalyptic number.

It is an amenable number.

61155613 is a deficient number, since it is larger than the sum of its proper divisors (3597407).

61155613 is a wasteful number, since it uses less digits than its factorization.

61155613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597406.

The product of its digits is 2700, while the sum is 28.

The square root of 61155613 is about 7820.2054320842. The cubic root of 61155613 is about 393.9841718499.

The spelling of 61155613 in words is "sixty-one million, one hundred fifty-five thousand, six hundred thirteen".