155091261 has 16 divisors (see below), whose sum is σ = 224328384. Its totient is φ = 94740864.

The previous prime is 155091241. The next prime is 155091301. The reversal of 155091261 is 162190551.

155091261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155091261 - 2¹¹ = 155089213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155091241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9171 + ... + 19856.

It is an arithmetic number, because the mean of its divisors is an integer number (14020524).

Almost surely, 2^155091261 is an apocalyptic number.

It is an amenable number.

155091261 is a deficient number, since it is larger than the sum of its proper divisors (69237123).

155091261 is a wasteful number, since it uses less digits than its factorization.

155091261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29180.

The product of its (nonzero) digits is 2700, while the sum is 30.

The square root of 155091261 is about 12453.5641886168. The cubic root of 155091261 is about 537.2739396228.

The spelling of 155091261 in words is "one hundred fifty-five million, ninety-one thousand, two hundred sixty-one".