71530418 has 4 divisors (see below), whose sum is σ = 107295630. Its totient is φ = 35765208.

The previous prime is 71530411. The next prime is 71530429. The reversal of 71530418 is 81403517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81403517 = 13 ⋅6261809.

It can be written as a sum of positive squares in only one way, i.e., 53831569 + 17698849 = 7337^2 + 4207^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71530411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17882603 + ... + 17882606.

Almost surely, 2^71530418 is an apocalyptic number.

71530418 is a deficient number, since it is larger than the sum of its proper divisors (35765212).

71530418 is a wasteful number, since it uses less digits than its factorization.

71530418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35765211.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 71530418 is about 8457.5657254319. The cubic root of 71530418 is about 415.1103746676.

The spelling of 71530418 in words is "seventy-one million, five hundred thirty thousand, four hundred eighteen".