76381649 has 2 divisors, whose sum is σ = 76381650. Its totient is φ = 76381648.

The previous prime is 76381603. The next prime is 76381651. The reversal of 76381649 is 94618367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45468049 + 30913600 = 6743^2 + 5560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76381649 is a prime.

Together with 76381651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76381549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38190824 + 38190825.

It is an arithmetic number, because the mean of its divisors is an integer number (38190825).

Almost surely, 2^76381649 is an apocalyptic number.

It is an amenable number.

76381649 is a deficient number, since it is larger than the sum of its proper divisors (1).

76381649 is an equidigital number, since it uses as much as digits as its factorization.

76381649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 76381649 is about 8739.6595471448. The cubic root of 76381649 is about 424.2902090121.

The spelling of 76381649 in words is "seventy-six million, three hundred eighty-one thousand, six hundred forty-nine".