71522451 has 96 divisors (see below), whose sum is σ = 147184128. Its totient is φ = 32209920.

The previous prime is 71522419. The next prime is 71522461. The reversal of 71522451 is 15422517.

It is not a de Polignac number, because 71522451 - 2⁵ = 71522419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71522401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 152920 + ... + 153386.

It is an arithmetic number, because the mean of its divisors is an integer number (1533168).

Almost surely, 2^71522451 is an apocalyptic number.

71522451 is an abundant number, since it is smaller than the sum of its proper divisors (75661677).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71522451 is a wasteful number, since it uses less digits than its factorization.

71522451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 518 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 71522451 is about 8457.0947139074. The cubic root of 71522451 is about 415.0949625429.

Adding to 71522451 its reverse (15422517), we get a palindrome (86944968).

The spelling of 71522451 in words is "seventy-one million, five hundred twenty-two thousand, four hundred fifty-one".