77616101 has 4 divisors (see below), whose sum is σ = 82181772. Its totient is φ = 73050432.

The previous prime is 77616079. The next prime is 77616107. The reversal of 77616101 is 10161677.

It is a Cunningham number, because it is equal to 8810²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10161677 = 421 ⋅24137.

It can be written as a sum of positive squares in 2 ways, for example, as 60435076 + 17181025 = 7774^2 + 4145^2 .

It is a cyclic number.

It is not a de Polignac number, because 77616101 - 2²² = 73421797 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 (77616107) 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, 2282810 + ... + 2282843.

It is an arithmetic number, because the mean of its divisors is an integer number (20545443).

Almost surely, 2^77616101 is an apocalyptic number.

It is an amenable number.

77616101 is a deficient number, since it is larger than the sum of its proper divisors (4565671).

77616101 is a wasteful number, since it uses less digits than its factorization.

77616101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565670.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 77616101 is about 8810.0000567537. Note that the first 4 decimals coincide. The cubic root of 77616101 is about 426.5637451810.

Adding to 77616101 its reverse (10161677), we get a palindrome (87777778).

The spelling of 77616101 in words is "seventy-seven million, six hundred sixteen thousand, one hundred one".