13605551 has 2 divisors, whose sum is σ = 13605552. Its totient is φ = 13605550.

The previous prime is 13605547. The next prime is 13605601. The reversal of 13605551 is 15550631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13605551 - 2² = 13605547 is a prime.

It is a super-2 number, since 2×13605551² = 370222036027202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13605551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13605541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6802775 + 6802776.

It is an arithmetic number, because the mean of its divisors is an integer number (6802776).

Almost surely, 2^13605551 is an apocalyptic number.

13605551 is a deficient number, since it is larger than the sum of its proper divisors (1).

13605551 is an equidigital number, since it uses as much as digits as its factorization.

13605551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 13605551 is about 3688.5703192429. The cubic root of 13605551 is about 238.7291095818.

The spelling of 13605551 in words is "thirteen million, six hundred five thousand, five hundred fifty-one".