71634391 has 2 divisors, whose sum is σ = 71634392. Its totient is φ = 71634390.

The previous prime is 71634383. The next prime is 71634461. The reversal of 71634391 is 19343617.

It is a weak prime.

It is an emirp because it is prime and its reverse (19343617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71634391 - 2³ = 71634383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71634371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35817195 + 35817196.

It is an arithmetic number, because the mean of its divisors is an integer number (35817196).

Almost surely, 2^71634391 is an apocalyptic number.

71634391 is a deficient number, since it is larger than the sum of its proper divisors (1).

71634391 is an equidigital number, since it uses as much as digits as its factorization.

71634391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 71634391 is about 8463.7102384238. The cubic root of 71634391 is about 415.3114051159.

The spelling of 71634391 in words is "seventy-one million, six hundred thirty-four thousand, three hundred ninety-one".