7261547881 has 4 divisors (see below), whose sum is σ = 8298911872. Its totient is φ = 6224183892.

The previous prime is 7261547873. The next prime is 7261547921. The reversal of 7261547881 is 1887451627.

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: 1887451627 = 491 ⋅3844097.

It is a cyclic number.

It is not a de Polignac number, because 7261547881 - 2³ = 7261547873 is a prime.

It is a super-2 number, since 2×7261547881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7261547981) 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 3 ways as a sum of consecutive naturals, for example, 518681985 + ... + 518681998.

It is an arithmetic number, because the mean of its divisors is an integer number (2074727968).

Almost surely, 2^7261547881 is an apocalyptic number.

It is an amenable number.

7261547881 is a deficient number, since it is larger than the sum of its proper divisors (1037363991).

7261547881 is a wasteful number, since it uses less digits than its factorization.

7261547881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037363990.

The product of its digits is 752640, while the sum is 49.

The square root of 7261547881 is about 85214.7163405477. The cubic root of 7261547881 is about 1936.4653711341.

The spelling of 7261547881 in words is "seven billion, two hundred sixty-one million, five hundred forty-seven thousand, eight hundred eighty-one".