12891550 has 24 divisors (see below), whose sum is σ = 27404496. Its totient is φ = 4419840.

The previous prime is 12891547. The next prime is 12891553. The reversal of 12891550 is 5519821.

12891550 = T₂₉₃ + T₂₉₄ + ... + T₄₆₇.

It is an interprime number because it is at equal distance from previous prime (12891547) and next prime (12891553).

It is a super-2 number, since 2×12891550² = 332384122805000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891553) 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 11 ways as a sum of consecutive naturals, for example, 18067 + ... + 18766.

It is an arithmetic number, because the mean of its divisors is an integer number (1141854).

Almost surely, 2^12891550 is an apocalyptic number.

12891550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12891550 is an abundant number, since it is smaller than the sum of its proper divisors (14512946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12891550 is a wasteful number, since it uses less digits than its factorization.

12891550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36852 (or 36847 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 12891550 is about 3590.4804692409. The cubic root of 12891550 is about 234.4777901718.

The spelling of 12891550 in words is "twelve million, eight hundred ninety-one thousand, five hundred fifty".