71938561 has 4 divisors (see below), whose sum is σ = 72610992. Its totient is φ = 71266132.

The previous prime is 71938553. The next prime is 71938567. The reversal of 71938561 is 16583917.

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 a cyclic number.

It is not a de Polignac number, because 71938561 - 2³ = 71938553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71938567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336055 + ... + 336268.

It is an arithmetic number, because the mean of its divisors is an integer number (18152748).

Almost surely, 2^71938561 is an apocalyptic number.

It is an amenable number.

71938561 is a deficient number, since it is larger than the sum of its proper divisors (672431).

71938561 is a wasteful number, since it uses less digits than its factorization.

71938561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672430.

The product of its digits is 45360, while the sum is 40.

The square root of 71938561 is about 8481.6602737907. The cubic root of 71938561 is about 415.8983992047.

The spelling of 71938561 in words is "seventy-one million, nine hundred thirty-eight thousand, five hundred sixty-one".