71909143 has 2 divisors, whose sum is σ = 71909144. Its totient is φ = 71909142.

The previous prime is 71909113. The next prime is 71909171. The reversal of 71909143 is 34190917.

It is a strong prime.

It is an emirp because it is prime and its reverse (34190917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71909143 - 2⁹ = 71908631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71909099 and 71909108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71909113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35954571 + 35954572.

It is an arithmetic number, because the mean of its divisors is an integer number (35954572).

Almost surely, 2^71909143 is an apocalyptic number.

71909143 is a deficient number, since it is larger than the sum of its proper divisors (1).

71909143 is an equidigital number, since it uses as much as digits as its factorization.

71909143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 71909143 is about 8479.9258841101. The cubic root of 71909143 is about 415.8417000479.

It can be divided in two parts, 7190914 and 3, that added together give a palindrome (7190917).

The spelling of 71909143 in words is "seventy-one million, nine hundred nine thousand, one hundred forty-three".