71630891 has 2 divisors, whose sum is σ = 71630892. Its totient is φ = 71630890.

The previous prime is 71630887. The next prime is 71630941. The reversal of 71630891 is 19803617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71630891 - 2² = 71630887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71630831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35815445 + 35815446.

It is an arithmetic number, because the mean of its divisors is an integer number (35815446).

Almost surely, 2^71630891 is an apocalyptic number.

71630891 is a deficient number, since it is larger than the sum of its proper divisors (1).

71630891 is an equidigital number, since it uses as much as digits as its factorization.

71630891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 71630891 is about 8463.5034707856. The cubic root of 71630891 is about 415.3046410762.

The spelling of 71630891 in words is "seventy-one million, six hundred thirty thousand, eight hundred ninety-one".