13155551 has 2 divisors, whose sum is σ = 13155552. Its totient is φ = 13155550.

The previous prime is 13155539. The next prime is 13155559. The reversal of 13155551 is 15555131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13155551 - 2⁶ = 13155487 is a prime.

It is a super-2 number, since 2×13155551² = 346137044227202, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13155551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13155559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6577775 + 6577776.

It is an arithmetic number, because the mean of its divisors is an integer number (6577776).

Almost surely, 2^13155551 is an apocalyptic number.

13155551 is a deficient number, since it is larger than the sum of its proper divisors (1).

13155551 is an equidigital number, since it uses as much as digits as its factorization.

13155551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1875, while the sum is 26.

The square root of 13155551 is about 3627.0581743336. The cubic root of 13155551 is about 236.0675797558.

The spelling of 13155551 in words is "thirteen million, one hundred fifty-five thousand, five hundred fifty-one".