71944919 has 2 divisors, whose sum is σ = 71944920. Its totient is φ = 71944918.

The previous prime is 71944913. The next prime is 71944927. The reversal of 71944919 is 91944917.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71944919 is a prime.

It is a super-2 number, since 2×71944919² = 10352142739833122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71944919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71944913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35972459 + 35972460.

It is an arithmetic number, because the mean of its divisors is an integer number (35972460).

Almost surely, 2^71944919 is an apocalyptic number.

71944919 is a deficient number, since it is larger than the sum of its proper divisors (1).

71944919 is an equidigital number, since it uses as much as digits as its factorization.

71944919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 71944919 is about 8482.0350742024. The cubic root of 71944919 is about 415.9106513454.

The spelling of 71944919 in words is "seventy-one million, nine hundred forty-four thousand, nine hundred nineteen".