71530751 has 4 divisors (see below), whose sum is σ = 71613192. Its totient is φ = 71448312.

The previous prime is 71530717. The next prime is 71530769. The reversal of 71530751 is 15703517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15703517 = 83 ⋅189199.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71530751 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 (71530451) 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, 39905 + ... + 41658.

It is an arithmetic number, because the mean of its divisors is an integer number (17903298).

Almost surely, 2^71530751 is an apocalyptic number.

71530751 is a deficient number, since it is larger than the sum of its proper divisors (82441).

71530751 is an equidigital number, since it uses as much as digits as its factorization.

71530751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82440.

The product of its (nonzero) digits is 3675, while the sum is 29.

The square root of 71530751 is about 8457.5854119246. The cubic root of 71530751 is about 415.1110188296. Note that the first 3 decimals are identical.

The spelling of 71530751 in words is "seventy-one million, five hundred thirty thousand, seven hundred fifty-one".