12985551 has 12 divisors (see below), whose sum is σ = 18795712. Its totient is φ = 8639136.

The previous prime is 12985549. The next prime is 12985597. The reversal of 12985551 is 15558921.

It is a happy number.

12985551 is a `hidden beast` number, since 1 + 29 + 85 + 551 = 666.

12985551 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12985551 - 2¹ = 12985549 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 (12985051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4275 + ... + 6651.

Almost surely, 2^12985551 is an apocalyptic number.

12985551 is a deficient number, since it is larger than the sum of its proper divisors (5810161).

12985551 is a wasteful number, since it uses less digits than its factorization.

12985551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990 (or 2987 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The square root of 12985551 is about 3603.5470026073. The cubic root of 12985551 is about 235.0463225419.

The spelling of 12985551 in words is "twelve million, nine hundred eighty-five thousand, five hundred fifty-one".