71521254 has 48 divisors (see below), whose sum is σ = 177585408. Its totient is φ = 20378736.

The previous prime is 71521249. The next prime is 71521267. The reversal of 71521254 is 45212517.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73479 + ... + 74445.

It is an arithmetic number, because the mean of its divisors is an integer number (3699696).

Almost surely, 2^71521254 is an apocalyptic number.

71521254 is an abundant number, since it is smaller than the sum of its proper divisors (106064154).

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

71521254 is a wasteful number, since it uses less digits than its factorization.

71521254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569 (or 1566 counting only the distinct ones).

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

The square root of 71521254 is about 8457.0239446273. The cubic root of 71521254 is about 415.0926468531.

The spelling of 71521254 in words is "seventy-one million, five hundred twenty-one thousand, two hundred fifty-four".