61000555 has 16 divisors (see below), whose sum is σ = 91263744. Its totient is φ = 38026080.

The previous prime is 61000553. The next prime is 61000571. The reversal of 61000555 is 55500016.

It is not a de Polignac number, because 61000555 - 2¹ = 61000553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61000553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78837 + ... + 79606.

It is an arithmetic number, because the mean of its divisors is an integer number (5703984).

Almost surely, 2^61000555 is an apocalyptic number.

61000555 is a deficient number, since it is larger than the sum of its proper divisors (30263189).

61000555 is a wasteful number, since it uses less digits than its factorization.

61000555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158466.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 61000555 is about 7810.2852060600. The cubic root of 61000555 is about 393.6509121623.

The spelling of 61000555 in words is "sixty-one million, five hundred fifty-five", and thus it is an aban number.