77122891 has 4 divisors (see below), whose sum is σ = 77158984. Its totient is φ = 77086800.

The previous prime is 77122889. The next prime is 77122901. The reversal of 77122891 is 19822177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19822177 = 701 ⋅28277.

It is a cyclic number.

It is not a de Polignac number, because 77122891 - 2¹ = 77122889 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 77122891.

It is not an unprimeable number, because it can be changed into a prime (77122831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14625 + ... + 19186.

It is an arithmetic number, because the mean of its divisors is an integer number (19289746).

Almost surely, 2^77122891 is an apocalyptic number.

77122891 is a deficient number, since it is larger than the sum of its proper divisors (36093).

77122891 is a wasteful number, since it uses less digits than its factorization.

77122891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36092.

The product of its digits is 14112, while the sum is 37.

The square root of 77122891 is about 8781.9639602995. The cubic root of 77122891 is about 425.6582942409.

The spelling of 77122891 in words is "seventy-seven million, one hundred twenty-two thousand, eight hundred ninety-one".