13215501 has 32 divisors (see below), whose sum is σ = 22014720. Its totient is φ = 7774272.

The previous prime is 13215479. The next prime is 13215533. The reversal of 13215501 is 10551231.

13215501 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13215501 - 2¹⁹ = 12691213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7255 + ... + 8891.

It is an arithmetic number, because the mean of its divisors is an integer number (687960).

Almost surely, 2^13215501 is an apocalyptic number.

It is an amenable number.

13215501 is a deficient number, since it is larger than the sum of its proper divisors (8799219).

13215501 is a wasteful number, since it uses less digits than its factorization.

13215501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 13215501 is about 3635.3130539198. The cubic root of 13215501 is about 236.4256240100.

Adding to 13215501 its reverse (10551231), we get a palindrome (23766732).

The spelling of 13215501 in words is "thirteen million, two hundred fifteen thousand, five hundred one".