71573157 has 6 divisors (see below), whose sum is σ = 103383462. Its totient is φ = 47715432.

The previous prime is 71573149. The next prime is 71573231. The reversal of 71573157 is 75137517.

It is a happy number.

71573157 is a `hidden beast` number, since 71 + 573 + 15 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71470116 + 103041 = 8454^2 + 321^2 .

It is not a de Polignac number, because 71573157 - 2³ = 71573149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71573107) 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 5 ways as a sum of consecutive naturals, for example, 3976278 + ... + 3976295.

It is an arithmetic number, because the mean of its divisors is an integer number (17230577).

Almost surely, 2^71573157 is an apocalyptic number.

It is an amenable number.

71573157 is a deficient number, since it is larger than the sum of its proper divisors (31810305).

71573157 is a wasteful number, since it uses less digits than its factorization.

71573157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7952579 (or 7952576 counting only the distinct ones).

The product of its digits is 25725, while the sum is 36.

The square root of 71573157 is about 8460.0920207761. The cubic root of 71573157 is about 415.1930335350.

The spelling of 71573157 in words is "seventy-one million, five hundred seventy-three thousand, one hundred fifty-seven".