87216601 has 4 divisors (see below), whose sum is σ = 90224100. Its totient is φ = 84209104.

The previous prime is 87216583. The next prime is 87216637. The reversal of 87216601 is 10661278.

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 23775376 + 63441225 = 4876^2 + 7965^2 .

It is a cyclic number.

It is not a de Polignac number, because 87216601 - 2⁷ = 87216473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87216301) 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, 1503706 + ... + 1503763.

It is an arithmetic number, because the mean of its divisors is an integer number (22556025).

Almost surely, 2^87216601 is an apocalyptic number.

It is an amenable number.

87216601 is a deficient number, since it is larger than the sum of its proper divisors (3007499).

87216601 is a wasteful number, since it uses less digits than its factorization.

87216601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3007498.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 87216601 is about 9338.9828675290. The cubic root of 87216601 is about 443.4721851364.

Adding to 87216601 its reverse (10661278), we get a palindrome (97877879).

The spelling of 87216601 in words is "eighty-seven million, two hundred sixteen thousand, six hundred one".