13120231 has 2 divisors, whose sum is σ = 13120232.
Its totient is φ = 13120230.
The previous prime is 13120213. The next prime is 13120253. The reversal of 13120231 is 13202131.
Adding to 13120231 its reverse (13202131), we get a palindrome (26322362).
13120231 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.
Together with previous prime (13120213) it forms an Ormiston pair, because they use the same digits, order apart.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 13120231 - 25 = 13120199 is a prime.
It is a super-2 number, since 2×131202312 = 344280922986722, which contains 22 as substring.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (13120201) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560115 + 6560116.
It is an arithmetic number, because the mean of its divisors is an integer number (6560116).
Almost surely, 213120231 is an apocalyptic number.
13120231 is a deficient number, since it is larger than the sum of its proper divisors (1).
13120231 is an equidigital number, since it uses as much as digits as its factorization.
13120231 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 36, while the sum is 13.
The square root of 13120231 is about 3622.1859422178.
The cubic root of 13120231 is about 235.8561257992.
The spelling of 13120231 in words is "thirteen million, one hundred twenty thousand, two hundred thirty-one".