71554381 has 4 divisors (see below), whose sum is σ = 72534652. Its totient is φ = 70574112.

The previous prime is 71554369. The next prime is 71554387. The reversal of 71554381 is 18345517.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48080356 + 23474025 = 6934^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 71554381 - 2⁷ = 71554253 is a prime.

It is a super-2 number, since 2×71554381² = 10240058880586322, 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 (71554387) 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 3 ways as a sum of consecutive naturals, for example, 490026 + ... + 490171.

It is an arithmetic number, because the mean of its divisors is an integer number (18133663).

Almost surely, 2^71554381 is an apocalyptic number.

It is an amenable number.

71554381 is a deficient number, since it is larger than the sum of its proper divisors (980271).

71554381 is an equidigital number, since it uses as much as digits as its factorization.

71554381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980270.

The product of its digits is 16800, while the sum is 34.

The square root of 71554381 is about 8458.9822673889. The cubic root of 71554381 is about 415.1567240836.

Adding to 71554381 its reverse (18345517), we get a palindrome (89899898).

The spelling of 71554381 in words is "seventy-one million, five hundred fifty-four thousand, three hundred eighty-one".