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13997521 = 2413
BaseRepresentation
bin110101011001…
…010111010001
3222100010222201
4311121113101
512040410041
61220003201
7226656046
oct65312721
928303881
1013997521
1179a05aa
124830501
132b91275
141c051cd
151367631
hexd595d1

13997521 has 4 divisors (see below), whose sum is σ = 14055844. Its totient is φ = 13939440.

The previous prime is 13997519. The next prime is 13997537. The reversal of 13997521 is 12579931.

The cubic root of 13997521 is 241.

It is a perfect power (a cube), and thus also a powerful number.

13997521 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 7049025 + 6948496 = 2655^2 + 2636^2 .

It is not a de Polignac number, because 13997521 - 21 = 13997519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13997551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57961 + ... + 58201.

It is an arithmetic number, because the mean of its divisors is an integer number (3513961).

Almost surely, 213997521 is an apocalyptic number.

It is an amenable number.

13997521 is a deficient number, since it is larger than the sum of its proper divisors (58323).

13997521 is an frugal number, since it uses more digits than its factorization.

13997521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 241 counting only the distinct ones).

The product of its digits is 17010, while the sum is 37.

The square root of 13997521 is about 3741.3261017987.

The spelling of 13997521 in words is "thirteen million, nine hundred ninety-seven thousand, five hundred twenty-one".

Divisors: 1 241 58081 13997521