1550661841 has 4 divisors (see below), whose sum is σ = 1551073392. Its totient is φ = 1550250292.

The previous prime is 1550661811. The next prime is 1550661941. The reversal of 1550661841 is 1481660551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1550661841 - 2⁵ = 1550661809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1550661841.

It is not an unprimeable number, because it can be changed into a prime (1550661811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200071 + ... + 207676.

It is an arithmetic number, because the mean of its divisors is an integer number (387768348).

Almost surely, 2^1550661841 is an apocalyptic number.

It is an amenable number.

1550661841 is a deficient number, since it is larger than the sum of its proper divisors (411551).

1550661841 is an equidigital number, since it uses as much as digits as its factorization.

1550661841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411550.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1550661841 is about 39378.4438620929. The cubic root of 1550661841 is about 1157.4592231716.

The spelling of 1550661841 in words is "one billion, five hundred fifty million, six hundred sixty-one thousand, eight hundred forty-one".