13021649 has 4 divisors (see below), whose sum is σ = 13186560. Its totient is φ = 12856740.

The previous prime is 13021633. The next prime is 13021663. The reversal of 13021649 is 94612031.

13021649 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 13021649 - 2⁴ = 13021633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13021699) 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, 82337 + ... + 82494.

It is an arithmetic number, because the mean of its divisors is an integer number (3296640).

Almost surely, 2^13021649 is an apocalyptic number.

It is an amenable number.

13021649 is a deficient number, since it is larger than the sum of its proper divisors (164911).

13021649 is an equidigital number, since it uses as much as digits as its factorization.

13021649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164910.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 13021649 is about 3608.5522027539. The cubic root of 13021649 is about 235.2639195767.

The spelling of 13021649 in words is "thirteen million, twenty-one thousand, six hundred forty-nine".