61561575 has 36 divisors (see below), whose sum is σ = 110696040. Its totient is φ = 32704320.

The previous prime is 61561561. The next prime is 61561579. The reversal of 61561575 is 57516516.

It is not a de Polignac number, because 61561575 - 2⁷ = 61561447 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561579) 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 35 ways as a sum of consecutive naturals, for example, 93949 + ... + 94601.

It is an arithmetic number, because the mean of its divisors is an integer number (3074890).

Almost surely, 2^61561575 is an apocalyptic number.

61561575 is a deficient number, since it is larger than the sum of its proper divisors (49134465).

61561575 is a wasteful number, since it uses less digits than its factorization.

61561575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1080 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 61561575 is about 7846.1184671148. The cubic root of 61561575 is about 394.8540292769.

The spelling of 61561575 in words is "sixty-one million, five hundred sixty-one thousand, five hundred seventy-five".