71440381 has 2 divisors, whose sum is σ = 71440382. Its totient is φ = 71440380.

The previous prime is 71440367. The next prime is 71440387. The reversal of 71440381 is 18304417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71132356 + 308025 = 8434^2 + 555^2 .

It is an emirp because it is prime and its reverse (18304417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71440381 - 2⁵ = 71440349 is a prime.

It is a super-2 number, since 2×71440381² = 10207456074850322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71440387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35720190 + 35720191.

It is an arithmetic number, because the mean of its divisors is an integer number (35720191).

Almost surely, 2^71440381 is an apocalyptic number.

It is an amenable number.

71440381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71440381 is an equidigital number, since it uses as much as digits as its factorization.

71440381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 71440381 is about 8452.2411820771. The cubic root of 71440381 is about 414.9361318464.

Adding to 71440381 its reverse (18304417), we get a palindrome (89744798).

The spelling of 71440381 in words is "seventy-one million, four hundred forty thousand, three hundred eighty-one".