71530881 has 4 divisors (see below), whose sum is σ = 95374512. Its totient is φ = 47687252.

The previous prime is 71530873. The next prime is 71530889. The reversal of 71530881 is 18803517.

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.

It is an interprime number because it is at equal distance from previous prime (71530873) and next prime (71530889).

It is a cyclic number.

It is not a de Polignac number, because 71530881 - 2³ = 71530873 is a prime.

It is a super-2 number, since 2×71530881² = 10233333873272322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71530889) 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, 11921811 + ... + 11921816.

It is an arithmetic number, because the mean of its divisors is an integer number (23843628).

Almost surely, 2^71530881 is an apocalyptic number.

It is an amenable number.

71530881 is a deficient number, since it is larger than the sum of its proper divisors (23843631).

71530881 is a wasteful number, since it uses less digits than its factorization.

71530881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23843630.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 71530881 is about 8457.5930973298. The cubic root of 71530881 is about 415.1112703037. Note that the first 3 decimals are identical.

The spelling of 71530881 in words is "seventy-one million, five hundred thirty thousand, eight hundred eighty-one".