71573121 has 12 divisors (see below), whose sum is σ = 103497940. Its totient is φ = 47662560.

The previous prime is 71573119. The next prime is 71573129. The reversal of 71573121 is 12137517.

It is a happy number.

71573121 is a `hidden beast` number, since 71 + 573 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 41990400 + 29582721 = 6480^2 + 5439^2 .

It is not a de Polignac number, because 71573121 - 2¹ = 71573119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71573129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5295 + ... + 13083.

Almost surely, 2^71573121 is an apocalyptic number.

It is an amenable number.

71573121 is a deficient number, since it is larger than the sum of its proper divisors (31924819).

71573121 is a wasteful number, since it uses less digits than its factorization.

71573121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8816 (or 8813 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 71573121 is about 8460.0898931394. The cubic root of 71573121 is about 415.1929639234.

The spelling of 71573121 in words is "seventy-one million, five hundred seventy-three thousand, one hundred twenty-one".