76347991 has 2 divisors, whose sum is σ = 76347992. Its totient is φ = 76347990.

The previous prime is 76347989. The next prime is 76348033. The reversal of 76347991 is 19974367.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76347991 - 2¹ = 76347989 is a prime.

Together with 76347989, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76347911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38173995 + 38173996.

It is an arithmetic number, because the mean of its divisors is an integer number (38173996).

Almost surely, 2^76347991 is an apocalyptic number.

76347991 is a deficient number, since it is larger than the sum of its proper divisors (1).

76347991 is an equidigital number, since it uses as much as digits as its factorization.

76347991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 46.

The square root of 76347991 is about 8737.7337450852. The cubic root of 76347991 is about 424.2278779061.

It can be divided in two parts, 7634 and 7991, that added together give a 6-th power (15625 = 5⁶).

The spelling of 76347991 in words is "seventy-six million, three hundred forty-seven thousand, nine hundred ninety-one".