71491393 has 2 divisors, whose sum is σ = 71491394. Its totient is φ = 71491392.

The previous prime is 71491379. The next prime is 71491411. The reversal of 71491393 is 39319417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46009089 + 25482304 = 6783^2 + 5048^2 .

It is a cyclic number.

It is not a de Polignac number, because 71491393 - 2⁵ = 71491361 is a prime.

It is a super-2 number, since 2×71491393² = 10222038546160898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71491333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35745696 + 35745697.

It is an arithmetic number, because the mean of its divisors is an integer number (35745697).

Almost surely, 2^71491393 is an apocalyptic number.

It is an amenable number.

71491393 is a deficient number, since it is larger than the sum of its proper divisors (1).

71491393 is an equidigital number, since it uses as much as digits as its factorization.

71491393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 37.

The square root of 71491393 is about 8455.2583047474. The cubic root of 71491393 is about 415.0348700559.

The spelling of 71491393 in words is "seventy-one million, four hundred ninety-one thousand, three hundred ninety-three".