61538055 has 32 divisors (see below), whose sum is σ = 104163840. Its totient is φ = 30936960.

The previous prime is 61538053. The next prime is 61538063. The reversal of 61538055 is 55083516.

It is not a de Polignac number, because 61538055 - 2¹ = 61538053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61538053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74545 + ... + 75365.

It is an arithmetic number, because the mean of its divisors is an integer number (3255120).

Almost surely, 2^61538055 is an apocalyptic number.

61538055 is a deficient number, since it is larger than the sum of its proper divisors (42625785).

61538055 is a wasteful number, since it uses less digits than its factorization.

61538055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 61538055 is about 7844.6194936402. The cubic root of 61538055 is about 394.8037373552.

The spelling of 61538055 in words is "sixty-one million, five hundred thirty-eight thousand, fifty-five".