13561281 has 6 divisors (see below), whose sum is σ = 19588530. Its totient is φ = 9040848.

The previous prime is 13561271. The next prime is 13561309. The reversal of 13561281 is 18216531.

It can be written as a sum of positive squares in only one way, i.e., 12362256 + 1199025 = 3516^2 + 1095^2 .

It is not a de Polignac number, because 13561281 - 2⁷ = 13561153 is a prime.

It is a super-2 number, since 2×13561281² = 367816684721922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13561271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 753396 + ... + 753413.

It is an arithmetic number, because the mean of its divisors is an integer number (3264755).

Almost surely, 2^13561281 is an apocalyptic number.

It is an amenable number.

13561281 is a deficient number, since it is larger than the sum of its proper divisors (6027249).

13561281 is a wasteful number, since it uses less digits than its factorization.

13561281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506815 (or 1506812 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 13561281 is about 3682.5644597210. The cubic root of 13561281 is about 238.4699011369.

It can be divided in two parts, 135 and 61281, that added together give a palindrome (61416).

The spelling of 13561281 in words is "thirteen million, five hundred sixty-one thousand, two hundred eighty-one".