71211397 has 4 divisors (see below), whose sum is σ = 72867520. Its totient is φ = 69555276.

The previous prime is 71211379. The next prime is 71211401. The reversal of 71211397 is 79311217.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71211397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71211307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827997 + ... + 828082.

It is an arithmetic number, because the mean of its divisors is an integer number (18216880).

Almost surely, 2^71211397 is an apocalyptic number.

It is an amenable number.

71211397 is a deficient number, since it is larger than the sum of its proper divisors (1656123).

71211397 is a wasteful number, since it uses less digits than its factorization.

71211397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656122.

The product of its digits is 2646, while the sum is 31.

The square root of 71211397 is about 8438.6845538863. The cubic root of 71211397 is about 414.4923332124.

The spelling of 71211397 in words is "seventy-one million, two hundred eleven thousand, three hundred ninety-seven".