71138407 has 2 divisors, whose sum is σ = 71138408. Its totient is φ = 71138406.

The previous prime is 71138381. The next prime is 71138423. The reversal of 71138407 is 70483117.

It is a strong prime.

It is an emirp because it is prime and its reverse (70483117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71138407 - 2⁷ = 71138279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71138447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35569203 + 35569204.

It is an arithmetic number, because the mean of its divisors is an integer number (35569204).

Almost surely, 2^71138407 is an apocalyptic number.

71138407 is a deficient number, since it is larger than the sum of its proper divisors (1).

71138407 is an equidigital number, since it uses as much as digits as its factorization.

71138407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 71138407 is about 8434.3587189543. The cubic root of 71138407 is about 414.3506698502.

The spelling of 71138407 in words is "seventy-one million, one hundred thirty-eight thousand, four hundred seven".