77855051 has 2 divisors, whose sum is σ = 77855052. Its totient is φ = 77855050.

The previous prime is 77855047. The next prime is 77855059. The reversal of 77855051 is 15055877.

It is a weak prime.

It is an emirp because it is prime and its reverse (15055877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77855051 - 2² = 77855047 is a prime.

It is a super-2 number, since 2×77855051² = 12122817932425202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 77854996 and 77855014.

It is not a weakly prime, because it can be changed into another prime (77855059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38927525 + 38927526.

It is an arithmetic number, because the mean of its divisors is an integer number (38927526).

Almost surely, 2^77855051 is an apocalyptic number.

77855051 is a deficient number, since it is larger than the sum of its proper divisors (1).

77855051 is an equidigital number, since it uses as much as digits as its factorization.

77855051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 77855051 is about 8823.5509291894. The cubic root of 77855051 is about 427.0010384134.

The spelling of 77855051 in words is "seventy-seven million, eight hundred fifty-five thousand, fifty-one".