87549151561 has 4 divisors (see below), whose sum is σ = 87553827972. Its totient is φ = 87544475152.

The previous prime is 87549151553. The next prime is 87549151567. The reversal of 87549151561 is 16515194578.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66478887225 + 21070264336 = 257835^2 + 145156^2 .

It is a cyclic number.

It is not a de Polignac number, because 87549151561 - 2³ = 87549151553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87549151499 and 87549151508.

It is not an unprimeable number, because it can be changed into a prime (87549151567) 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, 2310010 + ... + 2347603.

It is an arithmetic number, because the mean of its divisors is an integer number (21888456993).

Almost surely, 2^87549151561 is an apocalyptic number.

It is an amenable number.

87549151561 is a deficient number, since it is larger than the sum of its proper divisors (4676411).

87549151561 is a wasteful number, since it uses less digits than its factorization.

87549151561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676410.

The product of its digits is 1512000, while the sum is 52.

The spelling of 87549151561 in words is "eighty-seven billion, five hundred forty-nine million, one hundred fifty-one thousand, five hundred sixty-one".