71145919 has 4 divisors (see below), whose sum is σ = 76618696. Its totient is φ = 65673144.

The previous prime is 71145913. The next prime is 71145941. The reversal of 71145919 is 91954117.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71145919 - 2⁷ = 71145791 is a prime.

It is a super-2 number, since 2×71145919² = 10123483580709122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71145913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2736369 + ... + 2736394.

It is an arithmetic number, because the mean of its divisors is an integer number (19154674).

Almost surely, 2^71145919 is an apocalyptic number.

71145919 is a deficient number, since it is larger than the sum of its proper divisors (5472777).

71145919 is a wasteful number, since it uses less digits than its factorization.

71145919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472776.

The product of its digits is 11340, while the sum is 37.

The square root of 71145919 is about 8434.8040285474. The cubic root of 71145919 is about 414.3652540615.

The spelling of 71145919 in words is "seventy-one million, one hundred forty-five thousand, nine hundred nineteen".