71987233 has 2 divisors, whose sum is σ = 71987234. Its totient is φ = 71987232.

The previous prime is 71987191. The next prime is 71987243. The reversal of 71987233 is 33278917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70694464 + 1292769 = 8408^2 + 1137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71987233 is a prime.

It is not a weakly prime, because it can be changed into another prime (71987243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35993616 + 35993617.

It is an arithmetic number, because the mean of its divisors is an integer number (35993617).

Almost surely, 2^71987233 is an apocalyptic number.

It is an amenable number.

71987233 is a deficient number, since it is larger than the sum of its proper divisors (1).

71987233 is an equidigital number, since it uses as much as digits as its factorization.

71987233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 71987233 is about 8484.5290381965. The cubic root of 71987233 is about 415.9921738697.

The spelling of 71987233 in words is "seventy-one million, nine hundred eighty-seven thousand, two hundred thirty-three".