71542057 has 4 divisors (see below), whose sum is σ = 71559936. Its totient is φ = 71524180.

The previous prime is 71541989. The next prime is 71542063. The reversal of 71542057 is 75024517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75024517 = 101 ⋅742817.

It is a cyclic number.

It is not a de Polignac number, because 71542057 - 2¹¹ = 71540009 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71542357) 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 3 ways as a sum of consecutive naturals, for example, 132 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (17889984).

Almost surely, 2^71542057 is an apocalyptic number.

It is an amenable number.

71542057 is a deficient number, since it is larger than the sum of its proper divisors (17879).

71542057 is a wasteful number, since it uses less digits than its factorization.

71542057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17878.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 71542057 is about 8458.2537795930. The cubic root of 71542057 is about 415.1328882022.

The spelling of 71542057 in words is "seventy-one million, five hundred forty-two thousand, fifty-seven".