71530405 has 4 divisors (see below), whose sum is σ = 85836492. Its totient is φ = 57224320.

The previous prime is 71530397. The next prime is 71530409. The reversal of 71530405 is 50403517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50403517 = 397 ⋅126961.

It can be written as a sum of positive squares in 2 ways, for example, as 7306209 + 64224196 = 2703^2 + 8014^2 .

It is not a de Polignac number, because 71530405 - 2³ = 71530397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71530405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71530409) 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, 7153036 + ... + 7153045.

It is an arithmetic number, because the mean of its divisors is an integer number (21459123).

Almost surely, 2^71530405 is an apocalyptic number.

It is an amenable number.

71530405 is a deficient number, since it is larger than the sum of its proper divisors (14306087).

71530405 is a wasteful number, since it uses less digits than its factorization.

71530405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14306086.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 71530405 is about 8457.5649568892. The cubic root of 71530405 is about 415.1103495200.

The spelling of 71530405 in words is "seventy-one million, five hundred thirty thousand, four hundred five".