71218769 has 2 divisors, whose sum is σ = 71218770. Its totient is φ = 71218768.

The previous prime is 71218757. The next prime is 71218799. The reversal of 71218769 is 96781217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 238144 = 8425^2 + 488^2 .

It is a cyclic number.

It is not a de Polignac number, because 71218769 - 2²⁴ = 54441553 is a prime.

It is a super-2 number, since 2×71218769² = 10144226115750722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71218709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35609384 + 35609385.

It is an arithmetic number, because the mean of its divisors is an integer number (35609385).

Almost surely, 2^71218769 is an apocalyptic number.

It is an amenable number.

71218769 is a deficient number, since it is larger than the sum of its proper divisors (1).

71218769 is an equidigital number, since it uses as much as digits as its factorization.

71218769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 71218769 is about 8439.1213405188. The cubic root of 71218769 is about 414.5066358483.

The spelling of 71218769 in words is "seventy-one million, two hundred eighteen thousand, seven hundred sixty-nine".