71139361 has 2 divisors, whose sum is σ = 71139362. Its totient is φ = 71139360.

The previous prime is 71139337. The next prime is 71139371. The reversal of 71139361 is 16393117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71081761 + 57600 = 8431^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 71139361 - 2²⁵ = 37584929 is a prime.

It is not a weakly prime, because it can be changed into another prime (71139301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35569680 + 35569681.

It is an arithmetic number, because the mean of its divisors is an integer number (35569681).

Almost surely, 2^71139361 is an apocalyptic number.

It is an amenable number.

71139361 is a deficient number, since it is larger than the sum of its proper divisors (1).

71139361 is an equidigital number, since it uses as much as digits as its factorization.

71139361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 31.

The square root of 71139361 is about 8434.4152731532. The cubic root of 71139361 is about 414.3525220554.

The spelling of 71139361 in words is "seventy-one million, one hundred thirty-nine thousand, three hundred sixty-one".