13135861 has 2 divisors, whose sum is σ = 13135862. Its totient is φ = 13135860.

The previous prime is 13135823. The next prime is 13135873. The reversal of 13135861 is 16853131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 2540836 = 3255^2 + 1594^2 .

It is an emirp because it is prime and its reverse (16853131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13135861 - 2¹³ = 13127669 is a prime.

It is a super-2 number, since 2×13135861² = 345101688422642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13165861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6567930 + 6567931.

It is an arithmetic number, because the mean of its divisors is an integer number (6567931).

Almost surely, 2^13135861 is an apocalyptic number.

It is an amenable number.

13135861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13135861 is an equidigital number, since it uses as much as digits as its factorization.

13135861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 13135861 is about 3624.3428369844. The cubic root of 13135861 is about 235.9497463140.

Adding to 13135861 its reverse (16853131), we get a palindrome (29988992).

The spelling of 13135861 in words is "thirteen million, one hundred thirty-five thousand, eight hundred sixty-one".