61538575 has 18 divisors (see below), whose sum is σ = 87356264. Its totient is φ = 42126720.

The previous prime is 61538563. The next prime is 61538579. The reversal of 61538575 is 57583516.

It is not a de Polignac number, because 61538575 - 2⁹ = 61538063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61538579) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103479 + ... + 104071.

Almost surely, 2^61538575 is an apocalyptic number.

61538575 is a deficient number, since it is larger than the sum of its proper divisors (25817689).

61538575 is an frugal number, since it uses more digits than its factorization.

61538575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 605 counting only the distinct ones).

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

The square root of 61538575 is about 7844.6526373065. The cubic root of 61538575 is about 394.8048493899.

The spelling of 61538575 in words is "sixty-one million, five hundred thirty-eight thousand, five hundred seventy-five".