61530155 has 4 divisors (see below), whose sum is σ = 73836192. Its totient is φ = 49224120.

The previous prime is 61530127. The next prime is 61530179. The reversal of 61530155 is 55103516.

61530155 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 is a de Polignac number, because none of the positive numbers 2^k-61530155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 6153011 + ... + 6153020.

It is an arithmetic number, because the mean of its divisors is an integer number (18459048).

Almost surely, 2^61530155 is an apocalyptic number.

61530155 is a deficient number, since it is larger than the sum of its proper divisors (12306037).

61530155 is a wasteful number, since it uses less digits than its factorization.

61530155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12306036.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 61530155 is about 7844.1159476387. The cubic root of 61530155 is about 394.7868422106.

The spelling of 61530155 in words is "sixty-one million, five hundred thirty thousand, one hundred fifty-five".