77272081 has 2 divisors, whose sum is σ = 77272082. Its totient is φ = 77272080.

The previous prime is 77272079. The next prime is 77272109. The reversal of 77272081 is 18027277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 5022081 = 8500^2 + 2241^2 .

It is a cyclic number.

It is not a de Polignac number, because 77272081 - 2¹ = 77272079 is a prime.

It is a super-2 number, since 2×77272081² = 11941949004141122, which contains 22 as substring.

Together with 77272079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77272001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38636040 + 38636041.

It is an arithmetic number, because the mean of its divisors is an integer number (38636041).

Almost surely, 2^77272081 is an apocalyptic number.

It is an amenable number.

77272081 is a deficient number, since it is larger than the sum of its proper divisors (1).

77272081 is an equidigital number, since it uses as much as digits as its factorization.

77272081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 77272081 is about 8790.4539700746. The cubic root of 77272081 is about 425.9325883177.

The spelling of 77272081 in words is "seventy-seven million, two hundred seventy-two thousand, eighty-one".