71687233 has 2 divisors, whose sum is σ = 71687234. Its totient is φ = 71687232.

The previous prime is 71687219. The next prime is 71687269. The reversal of 71687233 is 33278617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48762289 + 22924944 = 6983^2 + 4788^2 .

It is an emirp because it is prime and its reverse (33278617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71687233 - 2⁵ = 71687201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71687192 and 71687201.

It is not a weakly prime, because it can be changed into another prime (71687293) 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, 35843616 + 35843617.

It is an arithmetic number, because the mean of its divisors is an integer number (35843617).

Almost surely, 2^71687233 is an apocalyptic number.

It is an amenable number.

71687233 is a deficient number, since it is larger than the sum of its proper divisors (1).

71687233 is an equidigital number, since it uses as much as digits as its factorization.

71687233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 71687233 is about 8466.8313435429. The cubic root of 71687233 is about 415.4134998916.

The spelling of 71687233 in words is "seventy-one million, six hundred eighty-seven thousand, two hundred thirty-three".