71451389 has 4 divisors (see below), whose sum is σ = 73915260. Its totient is φ = 68987520.

The previous prime is 71451371. The next prime is 71451407. The reversal of 71451389 is 98315417.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (71451371) and next prime (71451407).

It can be written as a sum of positive squares in 2 ways, for example, as 12545764 + 58905625 = 3542^2 + 7675^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71451389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71451349) 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, 1231892 + ... + 1231949.

It is an arithmetic number, because the mean of its divisors is an integer number (18478815).

Almost surely, 2^71451389 is an apocalyptic number.

It is an amenable number.

71451389 is a deficient number, since it is larger than the sum of its proper divisors (2463871).

71451389 is a wasteful number, since it uses less digits than its factorization.

71451389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463870.

The product of its digits is 30240, while the sum is 38.

The square root of 71451389 is about 8452.8923452272. The cubic root of 71451389 is about 414.9574427740.

The spelling of 71451389 in words is "seventy-one million, four hundred fifty-one thousand, three hundred eighty-nine".