71971412 has 6 divisors (see below), whose sum is σ = 125949978. Its totient is φ = 35985704.

The previous prime is 71971409. The next prime is 71971423. The reversal of 71971412 is 21417917.

It can be written as a sum of positive squares in only one way, i.e., 71132356 + 839056 = 8434^2 + 916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8996423 + ... + 8996430.

It is an arithmetic number, because the mean of its divisors is an integer number (20991663).

Almost surely, 2^71971412 is an apocalyptic number.

It is an amenable number.

71971412 is a deficient number, since it is larger than the sum of its proper divisors (53978566).

71971412 is a wasteful number, since it uses less digits than its factorization.

71971412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17992857 (or 17992855 counting only the distinct ones).

The product of its digits is 3528, while the sum is 32.

The square root of 71971412 is about 8483.5966429339. The cubic root of 71971412 is about 415.9616967322.

The spelling of 71971412 in words is "seventy-one million, nine hundred seventy-one thousand, four hundred twelve".