3981555573 has 4 divisors (see below), whose sum is σ = 5308740768. Its totient is φ = 2654370380.

The previous prime is 3981555569. The next prime is 3981555629. The reversal of 3981555573 is 3755551893.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3755551893 = 3 ⋅1251850631.

It is a cyclic number.

It is not a de Polignac number, because 3981555573 - 2² = 3981555569 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981555503) 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, 663592593 + ... + 663592598.

It is an arithmetic number, because the mean of its divisors is an integer number (1327185192).

Almost surely, 2^3981555573 is an apocalyptic number.

It is an amenable number.

3981555573 is a deficient number, since it is larger than the sum of its proper divisors (1327185195).

3981555573 is a wasteful number, since it uses less digits than its factorization.

3981555573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327185194.

The product of its digits is 2835000, while the sum is 51.

The square root of 3981555573 is about 63099.5687227734. The cubic root of 3981555573 is about 1584.9574002290.

The spelling of 3981555573 in words is "three billion, nine hundred eighty-one million, five hundred fifty-five thousand, five hundred seventy-three".