71634869 has 2 divisors, whose sum is σ = 71634870. Its totient is φ = 71634868.

The previous prime is 71634851. The next prime is 71634877. The reversal of 71634869 is 96843617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 5943844 = 8105^2 + 2438^2 .

It is a cyclic number.

It is not a de Polignac number, because 71634869 - 2²⁰ = 70586293 is a prime.

It is a super-2 number, since 2×71634869² = 10263108913294322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71634809) 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, 35817434 + 35817435.

It is an arithmetic number, because the mean of its divisors is an integer number (35817435).

Almost surely, 2^71634869 is an apocalyptic number.

It is an amenable number.

71634869 is a deficient number, since it is larger than the sum of its proper divisors (1).

71634869 is an equidigital number, since it uses as much as digits as its factorization.

71634869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 71634869 is about 8463.7384765835. The cubic root of 71634869 is about 415.3123288733.

The spelling of 71634869 in words is "seventy-one million, six hundred thirty-four thousand, eight hundred sixty-nine".