61387555 has 8 divisors (see below), whose sum is σ = 73749312. Its totient is φ = 49053888.

The previous prime is 61387549. The next prime is 61387559. The reversal of 61387555 is 55578316.

61387555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61387555 - 2¹¹ = 61385507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61387559) 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 7 ways as a sum of consecutive naturals, for example, 1867 + ... + 11236.

It is an arithmetic number, because the mean of its divisors is an integer number (9218664).

Almost surely, 2^61387555 is an apocalyptic number.

61387555 is a deficient number, since it is larger than the sum of its proper divisors (12361757).

61387555 is a wasteful number, since it uses less digits than its factorization.

61387555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14045.

The product of its digits is 126000, while the sum is 40.

The square root of 61387555 is about 7835.0210593208. The cubic root of 61387555 is about 394.4816251991.

The spelling of 61387555 in words is "sixty-one million, three hundred eighty-seven thousand, five hundred fifty-five".