71331397 has 2 divisors, whose sum is σ = 71331398. Its totient is φ = 71331396.

The previous prime is 71331373. The next prime is 71331409. The reversal of 71331397 is 79313317.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57744801 + 13586596 = 7599^2 + 3686^2 .

It is an emirp because it is prime and its reverse (79313317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71331397 - 2¹⁹ = 70807109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71331307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35665698 + 35665699.

It is an arithmetic number, because the mean of its divisors is an integer number (35665699).

Almost surely, 2^71331397 is an apocalyptic number.

It is an amenable number.

71331397 is a deficient number, since it is larger than the sum of its proper divisors (1).

71331397 is an equidigital number, since it uses as much as digits as its factorization.

71331397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907, while the sum is 34.

The square root of 71331397 is about 8445.7916739640. The cubic root of 71331397 is about 414.7250261491.

The spelling of 71331397 in words is "seventy-one million, three hundred thirty-one thousand, three hundred ninety-seven".