77801001 has 4 divisors (see below), whose sum is σ = 103734672. Its totient is φ = 51867332.

The previous prime is 77800967. The next prime is 77801023. The reversal of 77801001 is 10010877.

77801001 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77801001 - 2⁶ = 77800937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77801201) 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, 12966831 + ... + 12966836.

It is an arithmetic number, because the mean of its divisors is an integer number (25933668).

Almost surely, 2^77801001 is an apocalyptic number.

It is an amenable number.

77801001 is a deficient number, since it is larger than the sum of its proper divisors (25933671).

77801001 is a wasteful number, since it uses less digits than its factorization.

77801001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25933670.

The product of its (nonzero) digits is 392, while the sum is 24.

The square root of 77801001 is about 8820.4875715575. The cubic root of 77801001 is about 426.9022019698.

Adding to 77801001 its reverse (10010877), we get a palindrome (87811878).

The spelling of 77801001 in words is "seventy-seven million, eight hundred one thousand, one".