71537131 has 2 divisors, whose sum is σ = 71537132. Its totient is φ = 71537130.

The previous prime is 71537129. The next prime is 71537143. The reversal of 71537131 is 13173517.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71537131 - 2¹ = 71537129 is a prime.

It is a super-2 number, since 2×71537131² = 10235122223422322, which contains 22 as substring.

Together with 71537129, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 71537131.

It is not a weakly prime, because it can be changed into another prime (71537161) by changing a digit.

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 as a sum of consecutive naturals, namely, 35768565 + 35768566.

It is an arithmetic number, because the mean of its divisors is an integer number (35768566).

Almost surely, 2^71537131 is an apocalyptic number.

71537131 is a deficient number, since it is larger than the sum of its proper divisors (1).

71537131 is an equidigital number, since it uses as much as digits as its factorization.

71537131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2205, while the sum is 28.

The square root of 71537131 is about 8457.9625797233. The cubic root of 71537131 is about 415.1233600466.

The spelling of 71537131 in words is "seventy-one million, five hundred thirty-seven thousand, one hundred thirty-one".