71842129 has 4 divisors (see below), whose sum is σ = 71908020. Its totient is φ = 71776240.

The previous prime is 71842093. The next prime is 71842151. The reversal of 71842129 is 92124817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11235904 + 60606225 = 3352^2 + 7785^2 .

It is a cyclic number.

It is not a de Polignac number, because 71842129 - 2⁹ = 71841617 is a prime.

It is a super-2 number, since 2×71842129² = 10322582998505282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71842094 and 71842103.

It is not an unprimeable number, because it can be changed into a prime (71840129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31282 + ... + 33499.

It is an arithmetic number, because the mean of its divisors is an integer number (17977005).

Almost surely, 2^71842129 is an apocalyptic number.

It is an amenable number.

71842129 is a deficient number, since it is larger than the sum of its proper divisors (65891).

71842129 is a wasteful number, since it uses less digits than its factorization.

71842129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65890.

The product of its digits is 8064, while the sum is 34.

The square root of 71842129 is about 8475.9736313889. The cubic root of 71842129 is about 415.7124820017.

The spelling of 71842129 in words is "seventy-one million, eight hundred forty-two thousand, one hundred twenty-nine".