71943451 has 2 divisors, whose sum is σ = 71943452. Its totient is φ = 71943450.

The previous prime is 71943449. The next prime is 71943457. The reversal of 71943451 is 15434917.

It is a weak prime.

It is an emirp because it is prime and its reverse (15434917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71943451 - 2¹ = 71943449 is a prime.

Together with 71943449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71943457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35971725 + 35971726.

It is an arithmetic number, because the mean of its divisors is an integer number (35971726).

Almost surely, 2^71943451 is an apocalyptic number.

71943451 is a deficient number, since it is larger than the sum of its proper divisors (1).

71943451 is an equidigital number, since it uses as much as digits as its factorization.

71943451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 71943451 is about 8481.9485379245. The cubic root of 71943451 is about 415.9078225101.

The spelling of 71943451 in words is "seventy-one million, nine hundred forty-three thousand, four hundred fifty-one".