76531391 has 2 divisors, whose sum is σ = 76531392. Its totient is φ = 76531390.

The previous prime is 76531381. The next prime is 76531409. The reversal of 76531391 is 19313567.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76531391 - 2¹⁴ = 76515007 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76531321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38265695 + 38265696.

It is an arithmetic number, because the mean of its divisors is an integer number (38265696).

Almost surely, 2^76531391 is an apocalyptic number.

76531391 is a deficient number, since it is larger than the sum of its proper divisors (1).

76531391 is an equidigital number, since it uses as much as digits as its factorization.

76531391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 35.

The square root of 76531391 is about 8748.2221622453. Note that the first 3 decimals coincide. The cubic root of 76531391 is about 424.5672938535.

The spelling of 76531391 in words is "seventy-six million, five hundred thirty-one thousand, three hundred ninety-one".