8707521381 has 16 divisors (see below), whose sum is σ = 13161167040. Its totient is φ = 5076449280.

The previous prime is 8707521377. The next prime is 8707521413. The reversal of 8707521381 is 1831257078.

It is not a de Polignac number, because 8707521381 - 2² = 8707521377 is a prime.

It is a super-2 number, since 2×8707521381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8707521301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5874780 + ... + 5876261.

It is an arithmetic number, because the mean of its divisors is an integer number (822572940).

Almost surely, 2^8707521381 is an apocalyptic number.

It is an amenable number.

8707521381 is a deficient number, since it is larger than the sum of its proper divisors (4453645659).

8707521381 is a wasteful number, since it uses less digits than its factorization.

8707521381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11751076.

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 8707521381 is about 93314.1006547242. The cubic root of 8707521381 is about 2057.3026389897.

The spelling of 8707521381 in words is "eight billion, seven hundred seven million, five hundred twenty-one thousand, three hundred eighty-one".