77712161 has 8 divisors (see below), whose sum is σ = 79644864. Its totient is φ = 75802320.

The previous prime is 77712149. The next prime is 77712163. The reversal of 77712161 is 16121777.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77712161 - 2¹⁴ = 77695777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77712163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271 + ... + 12531.

It is an arithmetic number, because the mean of its divisors is an integer number (9955608).

Almost surely, 2^77712161 is an apocalyptic number.

It is an amenable number.

77712161 is a deficient number, since it is larger than the sum of its proper divisors (1932703).

77712161 is a wasteful number, since it uses less digits than its factorization.

77712161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11431.

The product of its digits is 4116, while the sum is 32.

The square root of 77712161 is about 8815.4501303110. The cubic root of 77712161 is about 426.7396486349.

The spelling of 77712161 in words is "seventy-seven million, seven hundred twelve thousand, one hundred sixty-one".