77491273 has 2 divisors, whose sum is σ = 77491274. Its totient is φ = 77491272.

The previous prime is 77491259. The next prime is 77491303. The reversal of 77491273 is 37219477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69939769 + 7551504 = 8363^2 + 2748^2 .

It is a cyclic number.

It is not a de Polignac number, because 77491273 - 2⁹ = 77490761 is a prime.

It is not a weakly prime, because it can be changed into another prime (77491223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38745636 + 38745637.

It is an arithmetic number, because the mean of its divisors is an integer number (38745637).

Almost surely, 2^77491273 is an apocalyptic number.

It is an amenable number.

77491273 is a deficient number, since it is larger than the sum of its proper divisors (1).

77491273 is an equidigital number, since it uses as much as digits as its factorization.

77491273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 40.

The square root of 77491273 is about 8802.9127565823. The cubic root of 77491273 is about 426.3349452742.

The spelling of 77491273 in words is "seventy-seven million, four hundred ninety-one thousand, two hundred seventy-three".