12149551 has 4 divisors (see below), whose sum is σ = 12541504. Its totient is φ = 11757600.

The previous prime is 12149539. The next prime is 12149563. The reversal of 12149551 is 15594121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15594121 = 593 ⋅26297.

It is an interprime number because it is at equal distance from previous prime (12149539) and next prime (12149563).

It is a cyclic number.

It is not a de Polignac number, because 12149551 - 2⁵ = 12149519 is a prime.

It is a super-2 number, since 2×12149551² = 295223179003202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12149351) 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, 195930 + ... + 195991.

It is an arithmetic number, because the mean of its divisors is an integer number (3135376).

Almost surely, 2^12149551 is an apocalyptic number.

12149551 is the 2205-th centered pentagonal number.

12149551 is a deficient number, since it is larger than the sum of its proper divisors (391953).

12149551 is an equidigital number, since it uses as much as digits as its factorization.

12149551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391952.

The product of its digits is 1800, while the sum is 28.

The square root of 12149551 is about 3485.6206047130. The cubic root of 12149551 is about 229.8899978072.

The spelling of 12149551 in words is "twelve million, one hundred forty-nine thousand, five hundred fifty-one".