61561547 has 4 divisors (see below), whose sum is σ = 64238160. Its totient is φ = 58884936.

The previous prime is 61561529. The next prime is 61561561. The reversal of 61561547 is 74516516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61561547 - 2⁶ = 61561483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61561447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338272 + ... + 1338317.

It is an arithmetic number, because the mean of its divisors is an integer number (16059540).

Almost surely, 2^61561547 is an apocalyptic number.

61561547 is a deficient number, since it is larger than the sum of its proper divisors (2676613).

61561547 is a wasteful number, since it uses less digits than its factorization.

61561547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676612.

The product of its digits is 25200, while the sum is 35.

The square root of 61561547 is about 7846.1166827928. The cubic root of 61561547 is about 394.8539694132.

The spelling of 61561547 in words is "sixty-one million, five hundred sixty-one thousand, five hundred forty-seven".