71945371 has 2 divisors, whose sum is σ = 71945372. Its totient is φ = 71945370.

The previous prime is 71945347. The next prime is 71945383. The reversal of 71945371 is 17354917.

It is a strong prime.

It is an emirp because it is prime and its reverse (17354917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71945371 - 2⁷ = 71945243 is a prime.

It is a super-2 number, since 2×71945371² = 10352272816655282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71945371.

It is not a weakly prime, because it can be changed into another prime (71940371) 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, 35972685 + 35972686.

It is an arithmetic number, because the mean of its divisors is an integer number (35972686).

Almost surely, 2^71945371 is an apocalyptic number.

71945371 is a deficient number, since it is larger than the sum of its proper divisors (1).

71945371 is an equidigital number, since it uses as much as digits as its factorization.

71945371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 37.

The square root of 71945371 is about 8482.0617187097. The cubic root of 71945371 is about 415.9115223415.

It can be divided in two parts, 7 and 1945371, that added together give a triangular number (1945378 = T₁₉₇₂).

The spelling of 71945371 in words is "seventy-one million, nine hundred forty-five thousand, three hundred seventy-one".