155550261 has 4 divisors (see below), whose sum is σ = 207400352. Its totient is φ = 103700172.

The previous prime is 155550259. The next prime is 155550301. The reversal of 155550261 is 162055551.

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 not a de Polignac number, because 155550261 - 2¹ = 155550259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155550251) 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 3 ways as a sum of consecutive naturals, for example, 25925041 + ... + 25925046.

It is an arithmetic number, because the mean of its divisors is an integer number (51850088).

Almost surely, 2^155550261 is an apocalyptic number.

It is an amenable number.

155550261 is a deficient number, since it is larger than the sum of its proper divisors (51850091).

155550261 is an equidigital number, since it uses as much as digits as its factorization.

155550261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51850090.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 155550261 is about 12471.9790330164. The cubic root of 155550261 is about 537.8034469002.

The spelling of 155550261 in words is "one hundred fifty-five million, five hundred fifty thousand, two hundred sixty-one".