71139651 has 12 divisors (see below), whose sum is σ = 104260296. Its totient is φ = 43114720.

The previous prime is 71139631. The next prime is 71139661. The reversal of 71139651 is 15693117.

It is a happy number.

It is not a de Polignac number, because 71139651 - 2⁵ = 71139619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (71139631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97626 + ... + 98351.

It is an arithmetic number, because the mean of its divisors is an integer number (8688358).

Almost surely, 2^71139651 is an apocalyptic number.

71139651 is a deficient number, since it is larger than the sum of its proper divisors (33120645).

71139651 is a wasteful number, since it uses less digits than its factorization.

71139651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196002 (or 195991 counting only the distinct ones).

The product of its digits is 5670, while the sum is 33.

The square root of 71139651 is about 8434.4324646060. The cubic root of 71139651 is about 414.3530850914.

The spelling of 71139651 in words is "seventy-one million, one hundred thirty-nine thousand, six hundred fifty-one".