71721461 has 8 divisors (see below), whose sum is σ = 82044480. Its totient is φ = 61417728.

The previous prime is 71721373. The next prime is 71721491. The reversal of 71721461 is 16412717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71721461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71721491) 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 7 ways as a sum of consecutive naturals, for example, 4310 + ... + 12728.

It is an arithmetic number, because the mean of its divisors is an integer number (10255560).

Almost surely, 2^71721461 is an apocalyptic number.

It is an amenable number.

71721461 is a deficient number, since it is larger than the sum of its proper divisors (10323019).

71721461 is a wasteful number, since it uses less digits than its factorization.

71721461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643.

The product of its digits is 2352, while the sum is 29.

The square root of 71721461 is about 8468.8524015949. The cubic root of 71721461 is about 415.4796042280.

The spelling of 71721461 in words is "seventy-one million, seven hundred twenty-one thousand, four hundred sixty-one".