1550555161 has 4 divisors (see below), whose sum is σ = 1556451072. Its totient is φ = 1544659252.

The previous prime is 1550555141. The next prime is 1550555197. The reversal of 1550555161 is 1615550551.

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 1550555161 - 2¹¹ = 1550553113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550555141) 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, 2947561 + ... + 2948086.

It is an arithmetic number, because the mean of its divisors is an integer number (389112768).

Almost surely, 2^1550555161 is an apocalyptic number.

It is an amenable number.

1550555161 is a deficient number, since it is larger than the sum of its proper divisors (5895911).

1550555161 is an equidigital number, since it uses as much as digits as its factorization.

1550555161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5895910.

The product of its (nonzero) digits is 18750, while the sum is 34.

The square root of 1550555161 is about 39377.0892906015. The cubic root of 1550555161 is about 1157.4326795417.

The spelling of 1550555161 in words is "one billion, five hundred fifty million, five hundred fifty-five thousand, one hundred sixty-one".