61506155 has 4 divisors (see below), whose sum is σ = 73807392. Its totient is φ = 49204920.

The previous prime is 61506131. The next prime is 61506167. The reversal of 61506155 is 55160516.

61506155 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 not a de Polignac number, because 61506155 - 2⁶ = 61506091 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, 6150611 + ... + 6150620.

It is an arithmetic number, because the mean of its divisors is an integer number (18451848).

Almost surely, 2^61506155 is an apocalyptic number.

61506155 is a deficient number, since it is larger than the sum of its proper divisors (12301237).

61506155 is a wasteful number, since it uses less digits than its factorization.

61506155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12301236.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 61506155 is about 7842.5859893278. The cubic root of 61506155 is about 394.7355063175.

The spelling of 61506155 in words is "sixty-one million, five hundred six thousand, one hundred fifty-five".