87548561 has 4 divisors (see below), whose sum is σ = 92156400. Its totient is φ = 82940724.

The previous prime is 87548537. The next prime is 87548563. The reversal of 87548561 is 16584578.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87548561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87548563) 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, 2303891 + ... + 2303928.

It is an arithmetic number, because the mean of its divisors is an integer number (23039100).

Almost surely, 2^87548561 is an apocalyptic number.

It is an amenable number.

87548561 is a deficient number, since it is larger than the sum of its proper divisors (4607839).

87548561 is a wasteful number, since it uses less digits than its factorization.

87548561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607838.

The product of its digits is 268800, while the sum is 44.

The square root of 87548561 is about 9356.7388015270. The cubic root of 87548561 is about 444.0341142660.

The spelling of 87548561 in words is "eighty-seven million, five hundred forty-eight thousand, five hundred sixty-one".