71142909 has 16 divisors (see below), whose sum is σ = 101383488. Its totient is φ = 44218112.

The previous prime is 71142901. The next prime is 71142917. The reversal of 71142909 is 90924117.

It is an interprime number because it is at equal distance from previous prime (71142901) and next prime (71142917).

It is a cyclic number.

It is not a de Polignac number, because 71142909 - 2³ = 71142901 is a prime.

It is a super-2 number, since 2×71142909² = 10122627001964562, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 71142909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71142901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1062 + ... + 11975.

It is an arithmetic number, because the mean of its divisors is an integer number (6336468).

Almost surely, 2^71142909 is an apocalyptic number.

It is an amenable number.

71142909 is a deficient number, since it is larger than the sum of its proper divisors (30240579).

71142909 is a wasteful number, since it uses less digits than its factorization.

71142909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13164.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 71142909 is about 8434.6255992783. The cubic root of 71142909 is about 414.3594104047.

The spelling of 71142909 in words is "seventy-one million, one hundred forty-two thousand, nine hundred nine".