71321963 has 2 divisors, whose sum is σ = 71321964. Its totient is φ = 71321962.

The previous prime is 71321959. The next prime is 71322007. The reversal of 71321963 is 36912317.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71321963 - 2² = 71321959 is a prime.

It is equal to p_4191197 and since 71321963 and 4191197 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (71821963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35660981 + 35660982.

It is an arithmetic number, because the mean of its divisors is an integer number (35660982).

Almost surely, 2^71321963 is an apocalyptic number.

71321963 is a deficient number, since it is larger than the sum of its proper divisors (1).

71321963 is an equidigital number, since it uses as much as digits as its factorization.

71321963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 71321963 is about 8445.2331524950. The cubic root of 71321963 is about 414.7067420621.

The spelling of 71321963 in words is "seventy-one million, three hundred twenty-one thousand, nine hundred sixty-three".