12920551 has 12 divisors (see below), whose sum is σ = 15587472. Its totient is φ = 10489824.

The previous prime is 12920507. The next prime is 12920563. The reversal of 12920551 is 15502921.

It is not a de Polignac number, because 12920551 - 2¹⁷ = 12789479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12920581) 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, 30 + ... + 5083.

It is an arithmetic number, because the mean of its divisors is an integer number (1298956).

Almost surely, 2^12920551 is an apocalyptic number.

12920551 is a deficient number, since it is larger than the sum of its proper divisors (2666921).

12920551 is an equidigital number, since it uses as much as digits as its factorization.

12920551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5158 (or 5139 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 12920551 is about 3594.5167964554. The cubic root of 12920551 is about 234.6534865922.

The spelling of 12920551 in words is "twelve million, nine hundred twenty thousand, five hundred fifty-one".