12699551 has 2 divisors, whose sum is σ = 12699552. Its totient is φ = 12699550.

The previous prime is 12699539. The next prime is 12699559. The reversal of 12699551 is 15599621.

It is a strong prime.

It is an emirp because it is prime and its reverse (15599621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12699551 - 2¹⁰ = 12698527 is a prime.

It is a super-2 number, since 2×12699551² = 322557191203202, which contains 22 as substring.

It is a Sophie Germain prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12699559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6349775 + 6349776.

It is an arithmetic number, because the mean of its divisors is an integer number (6349776).

Almost surely, 2^12699551 is an apocalyptic number.

12699551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12699551 is an equidigital number, since it uses as much as digits as its factorization.

12699551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 38.

The square root of 12699551 is about 3563.6429394652. The cubic root of 12699551 is about 233.3079058459.

The spelling of 12699551 in words is "twelve million, six hundred ninety-nine thousand, five hundred fifty-one".