7261808981 has 8 divisors (see below), whose sum is σ = 8300195904. Its totient is φ = 6223668480.

The previous prime is 7261808971. The next prime is 7261809019. The reversal of 7261808981 is 1898081627.

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 7261808981 - 2¹⁸ = 7261546837 is a prime.

It is a super-2 number, since 2×7261808981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7261808971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6581 + ... + 120693.

It is an arithmetic number, because the mean of its divisors is an integer number (1037524488).

Almost surely, 2^7261808981 is an apocalyptic number.

It is an amenable number.

7261808981 is a deficient number, since it is larger than the sum of its proper divisors (1038386923).

7261808981 is a wasteful number, since it uses less digits than its factorization.

7261808981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123211.

The product of its (nonzero) digits is 387072, while the sum is 50.

The square root of 7261808981 is about 85216.2483391518. The cubic root of 7261808981 is about 1936.4885803753.

The spelling of 7261808981 in words is "seven billion, two hundred sixty-one million, eight hundred eight thousand, nine hundred eighty-one".