71853139 has 2 divisors, whose sum is σ = 71853140. Its totient is φ = 71853138.

The previous prime is 71853121. The next prime is 71853143. The reversal of 71853139 is 93135817.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71853139 - 2¹⁷ = 71722067 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71853098 and 71853107.

It is not a weakly prime, because it can be changed into another prime (71853179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35926569 + 35926570.

It is an arithmetic number, because the mean of its divisors is an integer number (35926570).

Almost surely, 2^71853139 is an apocalyptic number.

71853139 is a deficient number, since it is larger than the sum of its proper divisors (1).

71853139 is an equidigital number, since it uses as much as digits as its factorization.

71853139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 71853139 is about 8476.6230894148. The cubic root of 71853139 is about 415.7337172699.

The spelling of 71853139 in words is "seventy-one million, eight hundred fifty-three thousand, one hundred thirty-nine".