61561047 has 8 divisors (see below), whose sum is σ = 83237760. Its totient is φ = 40462520.

The previous prime is 61561001. The next prime is 61561051. The reversal of 61561047 is 74016516.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61561047 is a prime.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 144297 + ... + 144722.

It is an arithmetic number, because the mean of its divisors is an integer number (10404720).

Almost surely, 2^61561047 is an apocalyptic number.

61561047 is a deficient number, since it is larger than the sum of its proper divisors (21676713).

61561047 is a wasteful number, since it uses less digits than its factorization.

61561047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289093.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 61561047 is about 7846.0848198321. The cubic root of 61561047 is about 394.8529004151.

The spelling of 61561047 in words is "sixty-one million, five hundred sixty-one thousand, forty-seven".