13061981 has 4 divisors (see below), whose sum is σ = 13365792. Its totient is φ = 12758172.

The previous prime is 13061957. The next prime is 13062017. The reversal of 13061981 is 18916031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13061981 - 2¹⁴ = 13045597 is a prime.

It is a super-2 number, since 2×13061981² = 341230695288722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13061921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151841 + ... + 151926.

It is an arithmetic number, because the mean of its divisors is an integer number (3341448).

Almost surely, 2^13061981 is an apocalyptic number.

It is an amenable number.

13061981 is a deficient number, since it is larger than the sum of its proper divisors (303811).

13061981 is an equidigital number, since it uses as much as digits as its factorization.

13061981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303810.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 13061981 is about 3614.1362730257. The cubic root of 13061981 is about 235.5065638276.

The spelling of 13061981 in words is "thirteen million, sixty-one thousand, nine hundred eighty-one".