13901569 has 6 divisors (see below), whose sum is σ = 15280370.
Its totient is φ = 12637680.
The previous prime is 13901567. The next prime is 13901579. The reversal of 13901569 is 96510931.
It can be written as a sum of positive squares in only one way, i.e., 12159169 + 1742400 = 3487^2 + 1320^2
It is not a de Polignac number, because 13901569 - 21 = 13901567 is a prime.
It is a super-2 number, since 2×139015692 = 386507241323522, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (13901567) 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, 57324 + ... + 57565.
Almost surely, 213901569 is an apocalyptic number.
It is an amenable number.
13901569 is a deficient number, since it is larger than the sum of its proper divisors (1378801).
13901569 is a wasteful number, since it uses less digits than its factorization.
13901569 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 114911 (or 114900 counting only the distinct ones).
The product of its (nonzero) digits is 7290, while the sum is 34.
The square root of 13901569 is about 3728.4807898124.
The cubic root of 13901569 is about 240.4480576734.
The spelling of 13901569 in words is "thirteen million, nine hundred one thousand, five hundred sixty-nine".