71969213 has 4 divisors (see below), whose sum is σ = 74450940. Its totient is φ = 69487488.

The previous prime is 71969201. The next prime is 71969243. The reversal of 71969213 is 31296917.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31296917 = 1709 ⋅18313.

It can be written as a sum of positive squares in 2 ways, for example, as 13935289 + 58033924 = 3733^2 + 7618^2 .

It is a cyclic number.

It is not a de Polignac number, because 71969213 - 2¹⁰ = 71968189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71969243) 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, 1240820 + ... + 1240877.

It is an arithmetic number, because the mean of its divisors is an integer number (18612735).

Almost surely, 2^71969213 is an apocalyptic number.

It is an amenable number.

71969213 is a deficient number, since it is larger than the sum of its proper divisors (2481727).

71969213 is a wasteful number, since it uses less digits than its factorization.

71969213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481726.

The product of its digits is 20412, while the sum is 38.

The square root of 71969213 is about 8483.4670388939. The cubic root of 71969213 is about 415.9574602858.

The spelling of 71969213 in words is "seventy-one million, nine hundred sixty-nine thousand, two hundred thirteen".