13500621541 has 4 divisors (see below), whose sum is σ = 14727950784. Its totient is φ = 12273292300.

The previous prime is 13500621527. The next prime is 13500621559. The reversal of 13500621541 is 14512600531.

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 13500621541 - 2⁵ = 13500621509 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 (13500621041) 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, 613664605 + ... + 613664626.

It is an arithmetic number, because the mean of its divisors is an integer number (3681987696).

Almost surely, 2^13500621541 is an apocalyptic number.

13500621541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13500621541 is a deficient number, since it is larger than the sum of its proper divisors (1227329243).

13500621541 is a wasteful number, since it uses less digits than its factorization.

13500621541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227329242.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 13500621541 in words is "thirteen billion, five hundred million, six hundred twenty-one thousand, five hundred forty-one".