8701531621 has 4 divisors (see below), whose sum is σ = 8703396000. Its totient is φ = 8699667244.

The previous prime is 8701531589. The next prime is 8701531627. The reversal of 8701531621 is 1261351078.

It is a happy number.

8701531621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 8701531621 - 2⁵ = 8701531589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8701531627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925171 + ... + 934528.

It is an arithmetic number, because the mean of its divisors is an integer number (2175849000).

Almost surely, 2^8701531621 is an apocalyptic number.

It is an amenable number.

8701531621 is a deficient number, since it is larger than the sum of its proper divisors (1864379).

8701531621 is a wasteful number, since it uses less digits than its factorization.

8701531621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864378.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 8701531621 is about 93282.0005199288. Note that the first 3 decimals coincide. The cubic root of 8701531621 is about 2056.8308026261.

Adding to 8701531621 its reverse (1261351078), we get a palindrome (9962882699).

The spelling of 8701531621 in words is "eight billion, seven hundred one million, five hundred thirty-one thousand, six hundred twenty-one".