71821429 has 4 divisors (see below), whose sum is σ = 74298060. Its totient is φ = 69344800.

The previous prime is 71821417. The next prime is 71821441. The reversal of 71821429 is 92412817.

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

It is an interprime number because it is at equal distance from previous prime (71821417) and next prime (71821441).

It can be written as a sum of positive squares in 2 ways, for example, as 15421329 + 56400100 = 3927^2 + 7510^2 .

It is not a de Polignac number, because 71821429 - 2⁵ = 71821397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71821394 and 71821403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71821229) 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, 1238272 + ... + 1238329.

It is an arithmetic number, because the mean of its divisors is an integer number (18574515).

Almost surely, 2^71821429 is an apocalyptic number.

It is an amenable number.

71821429 is a deficient number, since it is larger than the sum of its proper divisors (2476631).

71821429 is a wasteful number, since it uses less digits than its factorization.

71821429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476630.

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

The square root of 71821429 is about 8474.7524447620. The cubic root of 71821429 is about 415.6725515082.

The spelling of 71821429 in words is "seventy-one million, eight hundred twenty-one thousand, four hundred twenty-nine".