71521106 has 4 divisors (see below), whose sum is σ = 107281662. Its totient is φ = 35760552.

The previous prime is 71521103. The next prime is 71521127. The reversal of 71521106 is 60112517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45091225 + 26429881 = 6715^2 + 5141^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71521103) 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 as a sum of consecutive naturals, namely, 17880275 + ... + 17880278.

Almost surely, 2^71521106 is an apocalyptic number.

71521106 is a deficient number, since it is larger than the sum of its proper divisors (35760556).

71521106 is a wasteful number, since it uses less digits than its factorization.

71521106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35760555.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 71521106 is about 8457.0151944998. The cubic root of 71521106 is about 415.0923605338.

The spelling of 71521106 in words is "seventy-one million, five hundred twenty-one thousand, one hundred six".