3999545481 has 4 divisors (see below), whose sum is σ = 5332727312. Its totient is φ = 2666363652.

The previous prime is 3999545479. The next prime is 3999545483. The reversal of 3999545481 is 1845459993.

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 an interprime number because it is at equal distance from previous prime (3999545479) and next prime (3999545483).

It is not a de Polignac number, because 3999545481 - 2¹ = 3999545479 is a prime.

It is a super-2 number, since 2×3999545481² = 31992728109175042722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3999545483) 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, 666590911 + ... + 666590916.

It is an arithmetic number, because the mean of its divisors is an integer number (1333181828).

Almost surely, 2^3999545481 is an apocalyptic number.

It is an amenable number.

3999545481 is a deficient number, since it is larger than the sum of its proper divisors (1333181831).

3999545481 is a wasteful number, since it uses less digits than its factorization.

3999545481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333181830.

The product of its digits is 6998400, while the sum is 57.

The square root of 3999545481 is about 63241.9598130861. The cubic root of 3999545481 is about 1587.3409243625.

The spelling of 3999545481 in words is "three billion, nine hundred ninety-nine million, five hundred forty-five thousand, four hundred eighty-one".