12550991 has 2 divisors, whose sum is σ = 12550992. Its totient is φ = 12550990.

The previous prime is 12550957. The next prime is 12551003. The reversal of 12550991 is 19905521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12550991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12550931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6275495 + 6275496.

It is an arithmetic number, because the mean of its divisors is an integer number (6275496).

Almost surely, 2^12550991 is an apocalyptic number.

12550991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12550991 is an equidigital number, since it uses as much as digits as its factorization.

12550991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 12550991 is about 3542.7377831276. The cubic root of 12550991 is about 232.3945858894.

The spelling of 12550991 in words is "twelve million, five hundred fifty thousand, nine hundred ninety-one".