13969551 has 4 divisors (see below), whose sum is σ = 18626072. Its totient is φ = 9313032.

The previous prime is 13969537. The next prime is 13969559. The reversal of 13969551 is 15596931.

13969551 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13969551 - 2¹³ = 13961359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13969559) 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, 2328256 + ... + 2328261.

It is an arithmetic number, because the mean of its divisors is an integer number (4656518).

Almost surely, 2^13969551 is an apocalyptic number.

13969551 is a deficient number, since it is larger than the sum of its proper divisors (4656521).

13969551 is an equidigital number, since it uses as much as digits as its factorization.

13969551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656520.

The product of its digits is 36450, while the sum is 39.

The square root of 13969551 is about 3737.5862531853. The cubic root of 13969551 is about 240.8393700137.

It can be divided in two parts, 1396955 and 1, that added together give a triangular number (1396956 = T₁₆₇₁).

The spelling of 13969551 in words is "thirteen million, nine hundred sixty-nine thousand, five hundred fifty-one".