71019161 has 4 divisors (see below), whose sum is σ = 71561424. Its totient is φ = 70476900.

The previous prime is 71019121. The next prime is 71019163. The reversal of 71019161 is 16191017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16191017 = 727 ⋅22271.

It is a cyclic number.

It is not a de Polignac number, because 71019161 - 2¹⁰ = 71018137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71019161.

It is not an unprimeable number, because it can be changed into a prime (71019163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270935 + ... + 271196.

It is an arithmetic number, because the mean of its divisors is an integer number (17890356).

Almost surely, 2^71019161 is an apocalyptic number.

It is an amenable number.

71019161 is a deficient number, since it is larger than the sum of its proper divisors (542263).

71019161 is a wasteful number, since it uses less digits than its factorization.

71019161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542262.

The product of its (nonzero) digits is 378, while the sum is 26.

The square root of 71019161 is about 8427.2866926431. The cubic root of 71019161 is about 414.1190214552.

The spelling of 71019161 in words is "seventy-one million, nineteen thousand, one hundred sixty-one".