71242381 has 16 divisors (see below), whose sum is σ = 85968000. Its totient is φ = 57673728.

The previous prime is 71242351. The next prime is 71242397. The reversal of 71242381 is 18324217.

It is not a de Polignac number, because 71242381 - 2⁵ = 71242349 is a prime.

It is a super-2 number, since 2×71242381² = 10150953701098322, 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 (71242321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59121 + ... + 60313.

It is an arithmetic number, because the mean of its divisors is an integer number (5373000).

Almost surely, 2^71242381 is an apocalyptic number.

It is an amenable number.

71242381 is a deficient number, since it is larger than the sum of its proper divisors (14725619).

71242381 is a wasteful number, since it uses less digits than its factorization.

71242381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668.

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

The square root of 71242381 is about 8440.5201853914. The cubic root of 71242381 is about 414.5524395476.

Adding to 71242381 its reverse (18324217), we get a palindrome (89566598).

The spelling of 71242381 in words is "seventy-one million, two hundred forty-two thousand, three hundred eighty-one".