77344109 has 2 divisors, whose sum is σ = 77344110. Its totient is φ = 77344108.

The previous prime is 77344087. The next prime is 77344123. The reversal of 77344109 is 90144377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68475625 + 8868484 = 8275^2 + 2978^2 .

It is an emirp because it is prime and its reverse (90144377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77344109 - 2²⁰ = 76295533 is a prime.

It is a super-4 number, since 4×77344109⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77344129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38672054 + 38672055.

It is an arithmetic number, because the mean of its divisors is an integer number (38672055).

Almost surely, 2^77344109 is an apocalyptic number.

It is an amenable number.

77344109 is a deficient number, since it is larger than the sum of its proper divisors (1).

77344109 is an equidigital number, since it uses as much as digits as its factorization.

77344109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 77344109 is about 8794.5499600605. The cubic root of 77344109 is about 426.0648894225.

The spelling of 77344109 in words is "seventy-seven million, three hundred forty-four thousand, one hundred nine".