13539121 has 2 divisors, whose sum is σ = 13539122. Its totient is φ = 13539120.

The previous prime is 13539103. The next prime is 13539131. The reversal of 13539121 is 12193531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 579121 = 3600^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 13539121 - 2²³ = 5150513 is a prime.

It is equal to p₈₈₂₀₀₇ and since 13539121 and 882007 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (13539101) 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 as a sum of consecutive naturals, namely, 6769560 + 6769561.

It is an arithmetic number, because the mean of its divisors is an integer number (6769561).

Almost surely, 2^13539121 is an apocalyptic number.

It is an amenable number.

13539121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13539121 is an equidigital number, since it uses as much as digits as its factorization.

13539121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 25.

The square root of 13539121 is about 3679.5544567243. The cubic root of 13539121 is about 238.3399386349.

The spelling of 13539121 in words is "thirteen million, five hundred thirty-nine thousand, one hundred twenty-one".