71891293 has 2 divisors, whose sum is σ = 71891294. Its totient is φ = 71891292.

The previous prime is 71891257. The next prime is 71891297. The reversal of 71891293 is 39219817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40284409 + 31606884 = 6347^2 + 5622^2 .

It is a cyclic number.

It is not a de Polignac number, because 71891293 - 2¹³ = 71883101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71891297) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35945646 + 35945647.

It is an arithmetic number, because the mean of its divisors is an integer number (35945647).

Almost surely, 2^71891293 is an apocalyptic number.

It is an amenable number.

71891293 is a deficient number, since it is larger than the sum of its proper divisors (1).

71891293 is an equidigital number, since it uses as much as digits as its factorization.

71891293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 71891293 is about 8478.8733331735. The cubic root of 71891293 is about 415.8072890848.

The spelling of 71891293 in words is "seventy-one million, eight hundred ninety-one thousand, two hundred ninety-three".