4191548981 has 4 divisors (see below), whose sum is σ = 4203559500. Its totient is φ = 4179538464.

The previous prime is 4191548947. The next prime is 4191548987. The reversal of 4191548981 is 1898451914.

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 2341688881 + 1849860100 = 48391^2 + 43010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4191548981 is a prime.

It is a super-2 number, since 2×4191548981² = 35138165720244276722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4191548987) 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, 6004736 + ... + 6005433.

It is an arithmetic number, because the mean of its divisors is an integer number (1050889875).

Almost surely, 2^4191548981 is an apocalyptic number.

It is an amenable number.

4191548981 is a deficient number, since it is larger than the sum of its proper divisors (12010519).

4191548981 is a wasteful number, since it uses less digits than its factorization.

4191548981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010518.

The product of its digits is 414720, while the sum is 50.

The square root of 4191548981 is about 64742.1731254057. The cubic root of 4191548981 is about 1612.3457673208.

The spelling of 4191548981 in words is "four billion, one hundred ninety-one million, five hundred forty-eight thousand, nine hundred eighty-one".