13257009 has 12 divisors (see below), whose sum is σ = 19380816. Its totient is φ = 8731032.
The previous prime is 13257007. The next prime is 13257011. The reversal of 13257009 is 90075231.
It is an interprime number because it is at equal distance from previous prime (13257007) and next prime (13257011).
It is not a de Polignac number, because 13257009 - 21 = 13257007 is a prime.
It is a super-3 number, since 3×132570093 (a number of 22 digits) contains 333 as substring.
It is not an unprimeable number, because it can be changed into a prime (13257007) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8127 + ... + 9620.
It is an arithmetic number, because the mean of its divisors is an integer number (1615068).
Almost surely, 213257009 is an apocalyptic number.
It is an amenable number.
13257009 is a deficient number, since it is larger than the sum of its proper divisors (6123807).
13257009 is a wasteful number, since it uses less digits than its factorization.
13257009 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 17836 (or 17833 counting only the distinct ones).
The product of its (nonzero) digits is 1890, while the sum is 27.
The square root of 13257009 is about 3641.0175775461. The cubic root of 13257009 is about 236.6728916787.
The spelling of 13257009 in words is "thirteen million, two hundred fifty-seven thousand, nine".
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