71911951 has 2 divisors, whose sum is σ = 71911952. Its totient is φ = 71911950.

The previous prime is 71911913. The next prime is 71911963. The reversal of 71911951 is 15911917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71911951 - 2⁹ = 71911439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71911901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35955975 + 35955976.

It is an arithmetic number, because the mean of its divisors is an integer number (35955976).

Almost surely, 2^71911951 is an apocalyptic number.

71911951 is a deficient number, since it is larger than the sum of its proper divisors (1).

71911951 is an equidigital number, since it uses as much as digits as its factorization.

71911951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 34.

The square root of 71911951 is about 8480.0914499786. The cubic root of 71911951 is about 415.8471127500.

Subtracting from 71911951 its sum of digits (34), we obtain a palindrome (71911917).

The spelling of 71911951 in words is "seventy-one million, nine hundred eleven thousand, nine hundred fifty-one".