77022391 has 2 divisors, whose sum is σ = 77022392. Its totient is φ = 77022390.

The previous prime is 77022349. The next prime is 77022397. The reversal of 77022391 is 19322077.

It is a strong prime.

It is an emirp because it is prime and its reverse (19322077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77022391 - 2¹¹ = 77020343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77022397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38511195 + 38511196.

It is an arithmetic number, because the mean of its divisors is an integer number (38511196).

Almost surely, 2^77022391 is an apocalyptic number.

77022391 is a deficient number, since it is larger than the sum of its proper divisors (1).

77022391 is an equidigital number, since it uses as much as digits as its factorization.

77022391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 77022391 is about 8776.2401402879. The cubic root of 77022391 is about 425.4733199602.

The spelling of 77022391 in words is "seventy-seven million, twenty-two thousand, three hundred ninety-one".