71955911 has 2 divisors, whose sum is σ = 71955912. Its totient is φ = 71955910.

The previous prime is 71955889. The next prime is 71955913. The reversal of 71955911 is 11955917.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71955911 is a prime.

Together with 71955913, 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 (71955913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35977955 + 35977956.

It is an arithmetic number, because the mean of its divisors is an integer number (35977956).

Almost surely, 2^71955911 is an apocalyptic number.

71955911 is a deficient number, since it is larger than the sum of its proper divisors (1).

71955911 is an equidigital number, since it uses as much as digits as its factorization.

71955911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14175, while the sum is 38.

The square root of 71955911 is about 8482.6830071623. The cubic root of 71955911 is about 415.9318317018.

The spelling of 71955911 in words is "seventy-one million, nine hundred fifty-five thousand, nine hundred eleven".