77144999 has 2 divisors, whose sum is σ = 77145000. Its totient is φ = 77144998.

The previous prime is 77144993. The next prime is 77145049. The reversal of 77144999 is 99944177.

It is an a-pointer prime, because the next prime (77145049) can be obtained adding 77144999 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77144999 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77144993) 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, 38572499 + 38572500.

It is an arithmetic number, because the mean of its divisors is an integer number (38572500).

Almost surely, 2^77144999 is an apocalyptic number.

77144999 is a deficient number, since it is larger than the sum of its proper divisors (1).

77144999 is an equidigital number, since it uses as much as digits as its factorization.

77144999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 77144999 is about 8783.2225862721. Note that the first 3 decimals coincide. The cubic root of 77144999 is about 425.6989633358.

The spelling of 77144999 in words is "seventy-seven million, one hundred forty-four thousand, nine hundred ninety-nine".