71955889 has 2 divisors, whose sum is σ = 71955890. Its totient is φ = 71955888.

The previous prime is 71955887. The next prime is 71955911. The reversal of 71955889 is 98855917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46785600 + 25170289 = 6840^2 + 5017^2 .

It is a cyclic number.

It is not a de Polignac number, because 71955889 - 2¹ = 71955887 is a prime.

Together with 71955887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71955887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35977944 + 35977945.

It is an arithmetic number, because the mean of its divisors is an integer number (35977945).

Almost surely, 2^71955889 is an apocalyptic number.

It is an amenable number.

71955889 is a deficient number, since it is larger than the sum of its proper divisors (1).

71955889 is an equidigital number, since it uses as much as digits as its factorization.

71955889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 52.

The square root of 71955889 is about 8482.6817104027. The cubic root of 71955889 is about 415.9317893124.

The spelling of 71955889 in words is "seventy-one million, nine hundred fifty-five thousand, eight hundred eighty-nine".