127721613 has 8 divisors (see below), whose sum is σ = 170402848. Its totient is φ = 85094064.

The previous prime is 127721611. The next prime is 127721647. The reversal of 127721613 is 316127721.

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

It is not a de Polignac number, because 127721613 - 2¹ = 127721611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127721611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7495 + ... + 17652.

It is an arithmetic number, because the mean of its divisors is an integer number (21300356).

Almost surely, 2^127721613 is an apocalyptic number.

It is an amenable number.

127721613 is a deficient number, since it is larger than the sum of its proper divisors (42681235).

127721613 is a wasteful number, since it uses less digits than its factorization.

127721613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26843.

The product of its digits is 3528, while the sum is 30.

The square root of 127721613 is about 11301.3987187427. The cubic root of 127721613 is about 503.6027947207.

The spelling of 127721613 in words is "one hundred twenty-seven million, seven hundred twenty-one thousand, six hundred thirteen".