71521451 has 8 divisors (see below), whose sum is σ = 73327680. Its totient is φ = 69727168.

The previous prime is 71521423. The next prime is 71521459. The reversal of 71521451 is 15412517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71521451 - 2¹⁴ = 71505067 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 71521451.

It is not an unprimeable number, because it can be changed into a prime (71521459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9815 + ... + 15471.

It is an arithmetic number, because the mean of its divisors is an integer number (9165960).

Almost surely, 2^71521451 is an apocalyptic number.

71521451 is a deficient number, since it is larger than the sum of its proper divisors (1806229).

71521451 is a wasteful number, since it uses less digits than its factorization.

71521451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5973.

The product of its digits is 1400, while the sum is 26.

The square root of 71521451 is about 8457.0355917425. The cubic root of 71521451 is about 415.0930279667.

Adding to 71521451 its reverse (15412517), we get a palindrome (86933968).

The spelling of 71521451 in words is "seventy-one million, five hundred twenty-one thousand, four hundred fifty-one".