77145017 has 4 divisors (see below), whose sum is σ = 79805220. Its totient is φ = 74484816.

The previous prime is 77144999. The next prime is 77145049. The reversal of 77145017 is 71054177.

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: 71054177 = 47 ⋅1511791.

It can be written as a sum of positive squares in 2 ways, for example, as 34386496 + 42758521 = 5864^2 + 6539^2 .

It is a cyclic number.

It is not a de Polignac number, because 77145017 - 2¹⁰ = 77143993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77145217) 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, 1330058 + ... + 1330115.

It is an arithmetic number, because the mean of its divisors is an integer number (19951305).

Almost surely, 2^77145017 is an apocalyptic number.

It is an amenable number.

77145017 is a deficient number, since it is larger than the sum of its proper divisors (2660203).

77145017 is a wasteful number, since it uses less digits than its factorization.

77145017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660202.

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

The square root of 77145017 is about 8783.2236109529. The cubic root of 77145017 is about 425.6989964448.

The spelling of 77145017 in words is "seventy-seven million, one hundred forty-five thousand, seventeen".