13485781 has 2 divisors, whose sum is σ = 13485782. Its totient is φ = 13485780.

The previous prime is 13485739. The next prime is 13485793. The reversal of 13485781 is 18758431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13439556 + 46225 = 3666^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 13485781 - 2¹³ = 13477589 is a prime.

It is a super-2 number, since 2×13485781² = 363732578359922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13485781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13485701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6742890 + 6742891.

It is an arithmetic number, because the mean of its divisors is an integer number (6742891).

Almost surely, 2^13485781 is an apocalyptic number.

It is an amenable number.

13485781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13485781 is an equidigital number, since it uses as much as digits as its factorization.

13485781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 13485781 is about 3672.2991435884. The cubic root of 13485781 is about 238.0265311854.

The spelling of 13485781 in words is "thirteen million, four hundred eighty-five thousand, seven hundred eighty-one".