77731051 has 2 divisors, whose sum is σ = 77731052. Its totient is φ = 77731050.

The previous prime is 77731037. The next prime is 77731133. The reversal of 77731051 is 15013777.

It is a weak prime.

It is an emirp because it is prime and its reverse (15013777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77731051 - 2¹⁹ = 77206763 is a prime.

It is not a weakly prime, because it can be changed into another prime (77731351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38865525 + 38865526.

It is an arithmetic number, because the mean of its divisors is an integer number (38865526).

Almost surely, 2^77731051 is an apocalyptic number.

77731051 is a deficient number, since it is larger than the sum of its proper divisors (1).

77731051 is an equidigital number, since it uses as much as digits as its factorization.

77731051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5145, while the sum is 31.

The square root of 77731051 is about 8816.5214795859. The cubic root of 77731051 is about 426.7742226269.

The spelling of 77731051 in words is "seventy-seven million, seven hundred thirty-one thousand, fifty-one".