8161362787 has 4 divisors (see below), whose sum is σ = 8442789120. Its totient is φ = 7879936456.

The previous prime is 8161362779. The next prime is 8161362791. The reversal of 8161362787 is 7872631618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8161362787 - 2³ = 8161362779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8161362787.

It is not an unprimeable number, because it can be changed into a prime (8161365787) 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, 140713123 + ... + 140713180.

It is an arithmetic number, because the mean of its divisors is an integer number (2110697280).

Almost surely, 2^8161362787 is an apocalyptic number.

8161362787 is a deficient number, since it is larger than the sum of its proper divisors (281426333).

8161362787 is a wasteful number, since it uses less digits than its factorization.

8161362787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281426332.

The product of its digits is 677376, while the sum is 49.

The square root of 8161362787 is about 90340.2611630053. The cubic root of 8161362787 is about 2013.3574890534.

It can be divided in two parts, 81613 and 62787, that added together give a square (144400 = 380²).

The spelling of 8161362787 in words is "eight billion, one hundred sixty-one million, three hundred sixty-two thousand, seven hundred eighty-seven".