19550749 has 2 divisors, whose sum is σ = 19550750. Its totient is φ = 19550748.

The previous prime is 19550743. The next prime is 19550779. The reversal of 19550749 is 94705591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 7868025 = 3418^2 + 2805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19550749 is a prime.

It is a super-2 number, since 2×19550749² = 764463572922002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19550743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9775374 + 9775375.

It is an arithmetic number, because the mean of its divisors is an integer number (9775375).

Almost surely, 2^19550749 is an apocalyptic number.

It is an amenable number.

19550749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19550749 is an equidigital number, since it uses as much as digits as its factorization.

19550749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 19550749 is about 4421.6228921065. The cubic root of 19550749 is about 269.3939263335.

The spelling of 19550749 in words is "nineteen million, five hundred fifty thousand, seven hundred forty-nine".