77131801 has 4 divisors (see below), whose sum is σ = 78587172. Its totient is φ = 75676432.

The previous prime is 77131759. The next prime is 77131819. The reversal of 77131801 is 10813177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37454400 + 39677401 = 6120^2 + 6299^2 .

It is a cyclic number.

It is not a de Polignac number, because 77131801 - 2¹⁹ = 76607513 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 77131801.

It is not an unprimeable number, because it can be changed into a prime (77131891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727606 + ... + 727711.

It is an arithmetic number, because the mean of its divisors is an integer number (19646793).

Almost surely, 2^77131801 is an apocalyptic number.

It is an amenable number.

77131801 is a deficient number, since it is larger than the sum of its proper divisors (1455371).

77131801 is a wasteful number, since it uses less digits than its factorization.

77131801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455370.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 77131801 is about 8782.4712353642. The cubic root of 77131801 is about 425.6746856967.

Adding to 77131801 its reverse (10813177), we get a palindrome (87944978).

The spelling of 77131801 in words is "seventy-seven million, one hundred thirty-one thousand, eight hundred one".