3449557981 has 4 divisors (see below), whose sum is σ = 3449887132. Its totient is φ = 3449228832.

The previous prime is 3449557961. The next prime is 3449558003. The reversal of 3449557981 is 1897559443.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1073872900 + 2375685081 = 32770^2 + 48741^2 .

It is a cyclic number.

It is not a de Polignac number, because 3449557981 - 2²⁷ = 3315340253 is a prime.

It is a super-2 number, since 2×3449557981² = 23798900528561592722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3449557921) 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, 148320 + ... + 169993.

It is an arithmetic number, because the mean of its divisors is an integer number (862471783).

Almost surely, 2^3449557981 is an apocalyptic number.

It is an amenable number.

3449557981 is a deficient number, since it is larger than the sum of its proper divisors (329151).

3449557981 is a wasteful number, since it uses less digits than its factorization.

3449557981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329150.

The product of its digits is 5443200, while the sum is 55.

The square root of 3449557981 is about 58732.9377862201. The cubic root of 3449557981 is about 1510.9652733449.

The spelling of 3449557981 in words is "three billion, four hundred forty-nine million, five hundred fifty-seven thousand, nine hundred eighty-one".