77293081 has 2 divisors, whose sum is σ = 77293082. Its totient is φ = 77293080.

The previous prime is 77293063. The next prime is 77293123. The reversal of 77293081 is 18039277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76825225 + 467856 = 8765^2 + 684^2 .

It is an emirp because it is prime and its reverse (18039277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77293081 - 2⁷ = 77292953 is a prime.

It is a super-2 number, since 2×77293081² = 11948440740945122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77293081.

It is not a weakly prime, because it can be changed into another prime (77293001) 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, 38646540 + 38646541.

It is an arithmetic number, because the mean of its divisors is an integer number (38646541).

Almost surely, 2^77293081 is an apocalyptic number.

It is an amenable number.

77293081 is a deficient number, since it is larger than the sum of its proper divisors (1).

77293081 is an equidigital number, since it uses as much as digits as its factorization.

77293081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 77293081 is about 8791.6483664896. The cubic root of 77293081 is about 425.9711696271.

The spelling of 77293081 in words is "seventy-seven million, two hundred ninety-three thousand, eighty-one".