71911421 has 2 divisors, whose sum is σ = 71911422. Its totient is φ = 71911420.

The previous prime is 71911403. The next prime is 71911439. The reversal of 71911421 is 12411917.

It is a balanced prime because it is at equal distance from previous prime (71911403) and next prime (71911439).

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 6528025 = 8086^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 71911421 - 2¹⁴ = 71895037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71911451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35955710 + 35955711.

It is an arithmetic number, because the mean of its divisors is an integer number (35955711).

Almost surely, 2^71911421 is an apocalyptic number.

It is an amenable number.

71911421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71911421 is an equidigital number, since it uses as much as digits as its factorization.

71911421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 26.

The square root of 71911421 is about 8480.0602002580. The cubic root of 71911421 is about 415.8460911325.

The spelling of 71911421 in words is "seventy-one million, nine hundred eleven thousand, four hundred twenty-one".