19550641 has 16 divisors (see below), whose sum is σ = 21930048. Its totient is φ = 17280000.

The previous prime is 19550623. The next prime is 19550659. The reversal of 19550641 is 14605591.

19550641 = 291² + 292² + ... + 436².

It is an interprime number because it is at equal distance from previous prime (19550623) and next prime (19550659).

It is a 4-Lehmer number, since φ(19550641) divides (19550641-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 19550641 - 2⁷ = 19550513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19550441) 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 in 15 ways as a sum of consecutive naturals, for example, 77766 + ... + 78016.

It is an arithmetic number, because the mean of its divisors is an integer number (1370628).

Almost surely, 2^19550641 is an apocalyptic number.

19550641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19550641 is a deficient number, since it is larger than the sum of its proper divisors (2379407).

19550641 is a wasteful number, since it uses less digits than its factorization.

19550641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 19550641 is about 4421.6106793792. The cubic root of 19550641 is about 269.3934302810.

Subtracting from 19550641 its product of nonzero digits (5400), we obtain a square (19545241 = 4421²).

The spelling of 19550641 in words is "nineteen million, five hundred fifty thousand, six hundred forty-one".