113865078721 has 9 divisors (see below), whose sum is σ = 114811924899. Its totient is φ = 112925985984.

The previous prime is 113865078709. The next prime is 113865078781. The reversal of 113865078721 is 127870568311.

The square root of 113865078721 is 337439.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 74209932225 + 39655146496 = 272415^2 + 199136^2 .

It is not a de Polignac number, because 113865078721 - 2¹¹ = 113865076673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113865078781) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42853425 + ... + 42856081.

Almost surely, 2^113865078721 is an apocalyptic number.

113865078721 is the 337439-th square number.

113865078721 is the 168720-th centered octagonal number.

It is an amenable number.

113865078721 is a deficient number, since it is larger than the sum of its proper divisors (946846178).

113865078721 is an frugal number, since it uses more digits than its factorization.

113865078721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

Multiplying 113865078721 by its sum of digits (49), we get a square (5579388857329 = 2362073²).

The spelling of 113865078721 in words is "one hundred thirteen billion, eight hundred sixty-five million, seventy-eight thousand, seven hundred twenty-one".