4081521913 has 8 divisors (see below), whose sum is σ = 4698155840. Its totient is φ = 3473277840.

The previous prime is 4081521901. The next prime is 4081521923. The reversal of 4081521913 is 3191251804.

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

It is a cyclic number.

It is not a de Polignac number, because 4081521913 - 2⁵ = 4081521881 is a prime.

It is a super-2 number, since 2×4081521913² = 33317642252598359138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4081521923) 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, 2096418 + ... + 2098363.

It is an arithmetic number, because the mean of its divisors is an integer number (587269480).

Almost surely, 2^4081521913 is an apocalyptic number.

It is an amenable number.

4081521913 is a deficient number, since it is larger than the sum of its proper divisors (616633927).

4081521913 is a wasteful number, since it uses less digits than its factorization.

4081521913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194927.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 4081521913 is about 63886.7898160488. The cubic root of 4081521913 is about 1598.1126068893.

The spelling of 4081521913 in words is "four billion, eighty-one million, five hundred twenty-one thousand, nine hundred thirteen".