61547861 has 8 divisors (see below), whose sum is σ = 62726400. Its totient is φ = 60380320.

The previous prime is 61547813. The next prime is 61547867. The reversal of 61547861 is 16874516.

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-61547861 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 (61547867) 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, 9020 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (7840800).

Almost surely, 2^61547861 is an apocalyptic number.

61547861 is the 3509-th centered decagonal number.

It is an amenable number.

61547861 is a deficient number, since it is larger than the sum of its proper divisors (1178539).

61547861 is a wasteful number, since it uses less digits than its factorization.

61547861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499.

The product of its digits is 40320, while the sum is 38.

The square root of 61547861 is about 7845.2444831248. The cubic root of 61547861 is about 394.8247067094.

The spelling of 61547861 in words is "sixty-one million, five hundred forty-seven thousand, eight hundred sixty-one".