87213561 has 8 divisors (see below), whose sum is σ = 116555040. Its totient is φ = 58007232.

The previous prime is 87213559. The next prime is 87213563. The reversal of 87213561 is 16531278.

It is an interprime number because it is at equal distance from previous prime (87213559) and next prime (87213563).

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

It is not a de Polignac number, because 87213561 - 2¹ = 87213559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87213563) 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, 32271 + ... + 34868.

It is an arithmetic number, because the mean of its divisors is an integer number (14569380).

Almost surely, 2^87213561 is an apocalyptic number.

It is an amenable number.

87213561 is a deficient number, since it is larger than the sum of its proper divisors (29341479).

87213561 is a wasteful number, since it uses less digits than its factorization.

87213561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67575.

The product of its digits is 10080, while the sum is 33.

The square root of 87213561 is about 9338.8201074868. The cubic root of 87213561 is about 443.4670325580.

It can be divided in two parts, 872135 and 61, that multiplied together give a palindrome (53200235).

The spelling of 87213561 in words is "eighty-seven million, two hundred thirteen thousand, five hundred sixty-one".