71129653 has 4 divisors (see below), whose sum is σ = 81291040. Its totient is φ = 60968268.

The previous prime is 71129647. The next prime is 71129671. The reversal of 71129653 is 35692117.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35692117 = 677 ⋅52721.

It is a cyclic number.

It is not a de Polignac number, because 71129653 - 2⁵ = 71129621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71129603) 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, 5080683 + ... + 5080696.

It is an arithmetic number, because the mean of its divisors is an integer number (20322760).

Almost surely, 2^71129653 is an apocalyptic number.

It is an amenable number.

71129653 is a deficient number, since it is larger than the sum of its proper divisors (10161387).

71129653 is a wasteful number, since it uses less digits than its factorization.

71129653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161386.

The product of its digits is 11340, while the sum is 34.

The square root of 71129653 is about 8433.8397542282. The cubic root of 71129653 is about 414.3336730562. Note that the first 3 decimals are identical.

The spelling of 71129653 in words is "seventy-one million, one hundred twenty-nine thousand, six hundred fifty-three".