155091 has 8 divisors (see below), whose sum is σ = 219024. Its totient is φ = 97280.
The previous prime is 155087. The next prime is 155119. The reversal of 155091 is 190551.
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 155091 - 22 = 155087 is a prime.
It is not an unprimeable number, because it can be changed into a prime (155081) 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 7 ways as a sum of consecutive naturals, for example, 1470 + ... + 1571.
It is an arithmetic number, because the mean of its divisors is an integer number (27378).
2155091 is an apocalyptic number.
155091 is a deficient number, since it is larger than the sum of its proper divisors (63933).
155091 is a wasteful number, since it uses less digits than its factorization.
155091 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3061.
The product of its (nonzero) digits is 225, while the sum is 21.
The square root of 155091 is about 393.8159468584. The cubic root of 155091 is about 53.7273638233.
The spelling of 155091 in words is "one hundred fifty-five thousand, ninety-one".
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