77471491 has 2 divisors, whose sum is σ = 77471492. Its totient is φ = 77471490.

The previous prime is 77471489. The next prime is 77471501. The reversal of 77471491 is 19417477.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77471491 - 2¹ = 77471489 is a prime.

Together with 77471489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77471461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38735745 + 38735746.

It is an arithmetic number, because the mean of its divisors is an integer number (38735746).

Almost surely, 2^77471491 is an apocalyptic number.

77471491 is a deficient number, since it is larger than the sum of its proper divisors (1).

77471491 is an equidigital number, since it uses as much as digits as its factorization.

77471491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 40.

The square root of 77471491 is about 8801.7890794997. The cubic root of 77471491 is about 426.2986638740.

The spelling of 77471491 in words is "seventy-seven million, four hundred seventy-one thousand, four hundred ninety-one".