7520271681 has 16 divisors (see below), whose sum is σ = 10862243840. Its totient is φ = 4627855440.

The previous prime is 7520271673. The next prime is 7520271697. The reversal of 7520271681 is 1861720257.

It is not a de Polignac number, because 7520271681 - 2³ = 7520271673 is a prime.

It is a super-2 number, since 2×7520271681² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is the 86720-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7520271631) by changing a digit.

It is a nontrivial repunit in base 86719.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563905 + ... + 577086.

It is an arithmetic number, because the mean of its divisors is an integer number (678890240).

Almost surely, 2^7520271681 is an apocalyptic number.

It is an amenable number.

7520271681 is a deficient number, since it is larger than the sum of its proper divisors (3341972159).

7520271681 is a wasteful number, since it uses less digits than its factorization.

7520271681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141033 (or 1141007 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 7520271681 is about 86719.5000043243. The cubic root of 7520271681 is about 1959.1958106695.

The spelling of 7520271681 in words is "seven billion, five hundred twenty million, two hundred seventy-one thousand, six hundred eighty-one".