71425139 has 4 divisors (see below), whose sum is σ = 71459520. Its totient is φ = 71390760.

The previous prime is 71425103. The next prime is 71425163. The reversal of 71425139 is 93152417.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71425139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71425639) 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, 13859 + ... + 18300.

It is an arithmetic number, because the mean of its divisors is an integer number (17864880).

Almost surely, 2^71425139 is an apocalyptic number.

71425139 is a deficient number, since it is larger than the sum of its proper divisors (34381).

71425139 is a wasteful number, since it uses less digits than its factorization.

71425139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34380.

The product of its digits is 7560, while the sum is 32.

The square root of 71425139 is about 8451.3394796328. The cubic root of 71425139 is about 414.9066204960.

The spelling of 71425139 in words is "seventy-one million, four hundred twenty-five thousand, one hundred thirty-nine".