71512789 has 4 divisors (see below), whose sum is σ = 75276640. Its totient is φ = 67748940.

The previous prime is 71512787. The next prime is 71512817. The reversal of 71512789 is 98721517.

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: 98721517 = 107 ⋅922631.

It is a cyclic number.

It is not a de Polignac number, because 71512789 - 2¹ = 71512787 is a prime.

It is a super-2 number, since 2×71512789² = 10228157981117042, 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 (71512787) 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, 1881897 + ... + 1881934.

It is an arithmetic number, because the mean of its divisors is an integer number (18819160).

Almost surely, 2^71512789 is an apocalyptic number.

It is an amenable number.

71512789 is a deficient number, since it is larger than the sum of its proper divisors (3763851).

71512789 is a wasteful number, since it uses less digits than its factorization.

71512789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3763850.

The product of its digits is 35280, while the sum is 40.

The square root of 71512789 is about 8456.5234582540. The cubic root of 71512789 is about 415.0762699129.

The spelling of 71512789 in words is "seventy-one million, five hundred twelve thousand, seven hundred eighty-nine".