12721541 has 8 divisors (see below), whose sum is σ = 14650944. Its totient is φ = 10820160.

The previous prime is 12721531. The next prime is 12721549. The reversal of 12721541 is 14512721.

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

It is a cyclic number.

It is not a de Polignac number, because 12721541 - 2⁶ = 12721477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721549) 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, 6020 + ... + 7853.

It is an arithmetic number, because the mean of its divisors is an integer number (1831368).

Almost surely, 2^12721541 is an apocalyptic number.

It is an amenable number.

12721541 is a deficient number, since it is larger than the sum of its proper divisors (1929403).

12721541 is a wasteful number, since it uses less digits than its factorization.

12721541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14011.

The product of its digits is 560, while the sum is 23.

The square root of 12721541 is about 3566.7269309550. The cubic root of 12721541 is about 233.4424901966.

The spelling of 12721541 in words is "twelve million, seven hundred twenty-one thousand, five hundred forty-one".