61534987 has 4 divisors (see below), whose sum is σ = 61560576. Its totient is φ = 61509400.

The previous prime is 61534943. The next prime is 61535003. The reversal of 61534987 is 78943516.

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 61534987 - 2⁷ = 61534859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61534927) 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, 8764 + ... + 14137.

It is an arithmetic number, because the mean of its divisors is an integer number (15390144).

Almost surely, 2^61534987 is an apocalyptic number.

61534987 is a deficient number, since it is larger than the sum of its proper divisors (25589).

61534987 is a wasteful number, since it uses less digits than its factorization.

61534987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588.

The product of its digits is 181440, while the sum is 43.

The square root of 61534987 is about 7844.4239431586. The cubic root of 61534987 is about 394.7971762227.

The spelling of 61534987 in words is "sixty-one million, five hundred thirty-four thousand, nine hundred eighty-seven".