71025309 has 16 divisors (see below), whose sum is σ = 108618240. Its totient is φ = 45822240.

The previous prime is 71025307. The next prime is 71025313. The reversal of 71025309 is 90352017.

It is not a de Polignac number, because 71025309 - 2¹ = 71025307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71025301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41592 + ... + 43265.

It is an arithmetic number, because the mean of its divisors is an integer number (6788640).

Almost surely, 2^71025309 is an apocalyptic number.

It is an amenable number.

71025309 is a deficient number, since it is larger than the sum of its proper divisors (37592931).

71025309 is a wasteful number, since it uses less digits than its factorization.

71025309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84897 (or 84891 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 71025309 is about 8427.6514522137. The cubic root of 71025309 is about 414.1309709547.

The spelling of 71025309 in words is "seventy-one million, twenty-five thousand, three hundred nine".