13155531 has 8 divisors (see below), whose sum is σ = 18145680. Its totient is φ = 8467872.

The previous prime is 13155529. The next prime is 13155533. The reversal of 13155531 is 13555131.

It is an interprime number because it is at equal distance from previous prime (13155529) and next prime (13155533).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13155531 - 2¹ = 13155529 is a prime.

It is a super-2 number, since 2×13155531² = 346135991783922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13155533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75520 + ... + 75693.

It is an arithmetic number, because the mean of its divisors is an integer number (2268210).

Almost surely, 2^13155531 is an apocalyptic number.

13155531 is a deficient number, since it is larger than the sum of its proper divisors (4990149).

13155531 is a wasteful number, since it uses less digits than its factorization.

13155531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151245.

The product of its digits is 1125, while the sum is 24.

The square root of 13155531 is about 3627.0554172772. The cubic root of 13155531 is about 236.0674601269.

The spelling of 13155531 in words is "thirteen million, one hundred fifty-five thousand, five hundred thirty-one".