77011813 has 2 divisors, whose sum is σ = 77011814. Its totient is φ = 77011812.

The previous prime is 77011801. The next prime is 77011841. The reversal of 77011813 is 31811077.

It is an a-pointer prime, because the next prime (77011841) can be obtained adding 77011813 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64288324 + 12723489 = 8018^2 + 3567^2 .

It is a cyclic number.

It is not a de Polignac number, because 77011813 - 2²¹ = 74914661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77011213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38505906 + 38505907.

It is an arithmetic number, because the mean of its divisors is an integer number (38505907).

Almost surely, 2^77011813 is an apocalyptic number.

It is an amenable number.

77011813 is a deficient number, since it is larger than the sum of its proper divisors (1).

77011813 is an equidigital number, since it uses as much as digits as its factorization.

77011813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 77011813 is about 8775.6374697226. The cubic root of 77011813 is about 425.4538413698.

The spelling of 77011813 in words is "seventy-seven million, eleven thousand, eight hundred thirteen".