61534561 has 8 divisors (see below), whose sum is σ = 67235904. Its totient is φ = 55851120.

The previous prime is 61534541. The next prime is 61534573. The reversal of 61534561 is 16543516.

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

It is a cyclic number.

It is not a de Polignac number, because 61534561 - 2²¹ = 59437409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61534531) 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, 3316 + ... + 11578.

It is an arithmetic number, because the mean of its divisors is an integer number (8404488).

Almost surely, 2^61534561 is an apocalyptic number.

It is an amenable number.

61534561 is a deficient number, since it is larger than the sum of its proper divisors (5701343).

61534561 is a wasteful number, since it uses less digits than its factorization.

61534561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951.

The product of its digits is 10800, while the sum is 31.

The square root of 61534561 is about 7844.3967900661. The cubic root of 61534561 is about 394.7962651746.

The spelling of 61534561 in words is "sixty-one million, five hundred thirty-four thousand, five hundred sixty-one".