71651999 has 2 divisors, whose sum is σ = 71652000. Its totient is φ = 71651998.

The previous prime is 71651989. The next prime is 71652001. The reversal of 71651999 is 99915617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71651999 - 2¹² = 71647903 is a prime.

Together with 71652001, 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 (71651989) 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, 35825999 + 35826000.

It is an arithmetic number, because the mean of its divisors is an integer number (35826000).

Almost surely, 2^71651999 is an apocalyptic number.

71651999 is a deficient number, since it is larger than the sum of its proper divisors (1).

71651999 is an equidigital number, since it uses as much as digits as its factorization.

71651999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 47.

The square root of 71651999 is about 8464.7503802534. The cubic root of 71651999 is about 415.3454306913.

The spelling of 71651999 in words is "seventy-one million, six hundred fifty-one thousand, nine hundred ninety-nine".