71538751 has 2 divisors, whose sum is σ = 71538752. Its totient is φ = 71538750.

The previous prime is 71538659. The next prime is 71538767. The reversal of 71538751 is 15783517.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71538751 - 2⁹ = 71538239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71538751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71538451) 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, 35769375 + 35769376.

It is an arithmetic number, because the mean of its divisors is an integer number (35769376).

Almost surely, 2^71538751 is an apocalyptic number.

71538751 is a deficient number, since it is larger than the sum of its proper divisors (1).

71538751 is an equidigital number, since it uses as much as digits as its factorization.

71538751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 37.

The square root of 71538751 is about 8458.0583469257. The cubic root of 71538751 is about 415.1264935931.

The spelling of 71538751 in words is "seventy-one million, five hundred thirty-eight thousand, seven hundred fifty-one".