771145139 has 2 divisors, whose sum is σ = 771145140. Its totient is φ = 771145138.

The previous prime is 771145117. The next prime is 771145147. The reversal of 771145139 is 931541177.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771145139 is a prime.

It is a Sophie Germain prime.

It is equal to p_39737018 and since 771145139 and 39737018 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (771145439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385572569 + 385572570.

It is an arithmetic number, because the mean of its divisors is an integer number (385572570).

Almost surely, 2^771145139 is an apocalyptic number.

771145139 is a deficient number, since it is larger than the sum of its proper divisors (1).

771145139 is an equidigital number, since it uses as much as digits as its factorization.

771145139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 38.

The square root of 771145139 is about 27769.5001575469. The cubic root of 771145139 is about 917.0197905322.

The spelling of 771145139 in words is "seven hundred seventy-one million, one hundred forty-five thousand, one hundred thirty-nine".