15192781081 has 3 divisors (see below), whose sum is σ = 15192904341. Its totient is φ = 15192657822.

The previous prime is 15192781033. The next prime is 15192781127. The reversal of 15192781081 is 18018729151.

It is a happy number.

The square root of 15192781081 is 123259.

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

15192781081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 15192781081 - 2²⁹ = 14655910169 is a prime.

It is a super-2 number, since 2×15192781081² (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 (15192781481) 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 2 ways as a sum of consecutive naturals, for example, 61630 + ... + 184888.

It is an arithmetic number, because the mean of its divisors is an integer number (5064301447).

Almost surely, 2^15192781081 is an apocalyptic number.

15192781081 is the 123259-th square number.

15192781081 is the 61630-th centered octagonal number.

It is an amenable number.

15192781081 is a deficient number, since it is larger than the sum of its proper divisors (123260).

15192781081 is an frugal number, since it uses more digits than its factorization.

15192781081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246518 (or 123259 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 43.

The spelling of 15192781081 in words is "fifteen billion, one hundred ninety-two million, seven hundred eighty-one thousand, eighty-one".