13781069 has 4 divisors (see below), whose sum is σ = 13886400. Its totient is φ = 13675740.

The previous prime is 13781063. The next prime is 13781087. The reversal of 13781069 is 96018731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96018731 = 127 ⋅756053.

It is a cyclic number.

It is not a de Polignac number, because 13781069 - 2⁸ = 13780813 is a prime.

It is a super-2 number, since 2×13781069² = 379835725565522, 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 (13781063) 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, 52469 + ... + 52730.

It is an arithmetic number, because the mean of its divisors is an integer number (3471600).

Almost surely, 2^13781069 is an apocalyptic number.

It is an amenable number.

13781069 is a deficient number, since it is larger than the sum of its proper divisors (105331).

13781069 is a wasteful number, since it uses less digits than its factorization.

13781069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105330.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 13781069 is about 3712.2862228013. The cubic root of 13781069 is about 239.7512990847.

The spelling of 13781069 in words is "thirteen million, seven hundred eighty-one thousand, sixty-nine".