55446991 has 2 divisors, whose sum is σ = 55446992. Its totient is φ = 55446990.

The previous prime is 55446983. The next prime is 55447001. The reversal of 55446991 is 19964455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55446991 - 2³ = 55446983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55446901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27723495 + 27723496.

It is an arithmetic number, because the mean of its divisors is an integer number (27723496).

Almost surely, 2^55446991 is an apocalyptic number.

55446991 is a deficient number, since it is larger than the sum of its proper divisors (1).

55446991 is an equidigital number, since it uses as much as digits as its factorization.

55446991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The square root of 55446991 is about 7446.2736318242. The cubic root of 55446991 is about 381.3227013197.

The spelling of 55446991 in words is "fifty-five million, four hundred forty-six thousand, nine hundred ninety-one".