71405381 has 4 divisors (see below), whose sum is σ = 71484000. Its totient is φ = 71326764.

The previous prime is 71405351. The next prime is 71405417. The reversal of 71405381 is 18350417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18350417 = 29 ⋅632773.

It is a cyclic number.

It is not a de Polignac number, because 71405381 - 2²² = 67211077 is a prime.

It is a super-2 number, since 2×71405381² = 10197456871510322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71405311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37931 + ... + 39768.

It is an arithmetic number, because the mean of its divisors is an integer number (17871000).

Almost surely, 2^71405381 is an apocalyptic number.

It is an amenable number.

71405381 is a deficient number, since it is larger than the sum of its proper divisors (78619).

71405381 is an equidigital number, since it uses as much as digits as its factorization.

71405381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78618.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 71405381 is about 8450.1704716532. The cubic root of 71405381 is about 414.8683590792.

Adding to 71405381 its reverse (18350417), we get a palindrome (89755798).

It can be divided in two parts, 7140 and 5381, that added together give a palindrome (12521).

The spelling of 71405381 in words is "seventy-one million, four hundred five thousand, three hundred eighty-one".