7952138881 has 4 divisors (see below), whose sum is σ = 7962988372. Its totient is φ = 7941289392.

The previous prime is 7952138819. The next prime is 7952138893. The reversal of 7952138881 is 1888312597.

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 5532384400 + 2419754481 = 74380^2 + 49191^2 .

It is a cyclic number.

It is not a de Polignac number, because 7952138881 - 2¹³ = 7952130689 is a prime.

It is a super-4 number, since 4×7952138881⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7952138801) 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, 5423646 + ... + 5425111.

It is an arithmetic number, because the mean of its divisors is an integer number (1990747093).

Almost surely, 2^7952138881 is an apocalyptic number.

It is an amenable number.

7952138881 is a deficient number, since it is larger than the sum of its proper divisors (10849491).

7952138881 is a wasteful number, since it uses less digits than its factorization.

7952138881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10849490.

The product of its digits is 967680, while the sum is 52.

The square root of 7952138881 is about 89174.7659430626. The cubic root of 7952138881 is about 1996.0035931016.

The spelling of 7952138881 in words is "seven billion, nine hundred fifty-two million, one hundred thirty-eight thousand, eight hundred eighty-one".