77145071 has 4 divisors (see below), whose sum is σ = 77349000. Its totient is φ = 76941144.

The previous prime is 77145049. The next prime is 77145083. The reversal of 77145071 is 17054177.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17054177 = 7 ⋅2436311.

It is a cyclic number.

It is not a de Polignac number, because 77145071 - 2¹⁴ = 77128687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77145571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101396 + ... + 102153.

It is an arithmetic number, because the mean of its divisors is an integer number (19337250).

Almost surely, 2^77145071 is an apocalyptic number.

77145071 is a deficient number, since it is larger than the sum of its proper divisors (203929).

77145071 is a wasteful number, since it uses less digits than its factorization.

77145071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203928.

The product of its (nonzero) digits is 6860, while the sum is 32.

The square root of 77145071 is about 8783.2266849945. The cubic root of 77145071 is about 425.6990957718.

The spelling of 77145071 in words is "seventy-seven million, one hundred forty-five thousand, seventy-one".