71512989 has 4 divisors (see below), whose sum is σ = 95350656. Its totient is φ = 47675324.

The previous prime is 71512967. The next prime is 71513009. The reversal of 71512989 is 98921517.

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: 98921517 = 3 ⋅32973839.

It is a cyclic number.

It is not a de Polignac number, because 71512989 - 2¹¹ = 71510941 is a prime.

It is a super-2 number, since 2×71512989² = 10228215191428242, 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 71512989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71519989) 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 in 3 ways as a sum of consecutive naturals, for example, 11918829 + ... + 11918834.

It is an arithmetic number, because the mean of its divisors is an integer number (23837664).

Almost surely, 2^71512989 is an apocalyptic number.

It is an amenable number.

71512989 is a deficient number, since it is larger than the sum of its proper divisors (23837667).

71512989 is a wasteful number, since it uses less digits than its factorization.

71512989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23837666.

The product of its digits is 45360, while the sum is 42.

The square root of 71512989 is about 8456.5352834361. The cubic root of 71512989 is about 415.0766568609.

The spelling of 71512989 in words is "seventy-one million, five hundred twelve thousand, nine hundred eighty-nine".