71115489 has 15 divisors (see below), whose sum is σ = 106347747. Its totient is φ = 47359728.

The previous prime is 71115481. The next prime is 71115493. The reversal of 71115489 is 98451117.

The square root of 71115489 is 8433.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 67371264 = 1935^2 + 8208^2 .

It is not a de Polignac number, because 71115489 - 2³ = 71115481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71115481) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 75429 + ... + 76365.

Almost surely, 2^71115489 is an apocalyptic number.

71115489 is the 8433-rd square number.

71115489 is the 4217-th centered octagonal number.

It is an amenable number.

71115489 is a deficient number, since it is larger than the sum of its proper divisors (35232258).

71115489 is an frugal number, since it uses more digits than its factorization.

71115489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886 (or 940 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The cubic root of 71115489 is about 414.3061692352.

Multiplying 71115489 by its sum of digits (36), we get a square (2560157604 = 50598²).

The spelling of 71115489 in words is "seventy-one million, one hundred fifteen thousand, four hundred eighty-nine".