77161001 has 2 divisors, whose sum is σ = 77161002. Its totient is φ = 77161000.

The previous prime is 77160997. The next prime is 77161031. The reversal of 77161001 is 10016177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75672601 + 1488400 = 8699^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 77161001 - 2² = 77160997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77161031) 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 as a sum of consecutive naturals, namely, 38580500 + 38580501.

It is an arithmetic number, because the mean of its divisors is an integer number (38580501).

Almost surely, 2^77161001 is an apocalyptic number.

It is an amenable number.

77161001 is a deficient number, since it is larger than the sum of its proper divisors (1).

77161001 is an equidigital number, since it uses as much as digits as its factorization.

77161001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 23.

The square root of 77161001 is about 8784.1334803155. The cubic root of 77161001 is about 425.7283952020.

Adding to 77161001 its reverse (10016177), we get a palindrome (87177178).

The spelling of 77161001 in words is "seventy-seven million, one hundred sixty-one thousand, one".