71129973 has 4 divisors (see below), whose sum is σ = 94839968. Its totient is φ = 47419980.

The previous prime is 71129917. The next prime is 71130013. The reversal of 71129973 is 37992117.

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.

It is not a de Polignac number, because 71129973 - 2¹⁴ = 71113589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71129273) 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, 11854993 + ... + 11854998.

It is an arithmetic number, because the mean of its divisors is an integer number (23709992).

Almost surely, 2^71129973 is an apocalyptic number.

It is an amenable number.

71129973 is a deficient number, since it is larger than the sum of its proper divisors (23709995).

71129973 is a wasteful number, since it uses less digits than its factorization.

71129973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23709994.

The product of its digits is 23814, while the sum is 39.

The square root of 71129973 is about 8433.8587253997. The cubic root of 71129973 is about 414.3342943938.

The spelling of 71129973 in words is "seventy-one million, one hundred twenty-nine thousand, nine hundred seventy-three".