155290091 has 4 divisors (see below), whose sum is σ = 169407384. Its totient is φ = 141172800.

The previous prime is 155290049. The next prime is 155290103. The reversal of 155290091 is 190092551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155290091 - 2⁶ = 155290027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155290991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7058630 + ... + 7058651.

It is an arithmetic number, because the mean of its divisors is an integer number (42351846).

Almost surely, 2^155290091 is an apocalyptic number.

155290091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155290091 is a deficient number, since it is larger than the sum of its proper divisors (14117293).

155290091 is a wasteful number, since it uses less digits than its factorization.

155290091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14117292.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 155290091 is about 12461.5444869406. The cubic root of 155290091 is about 537.5034401078.

The spelling of 155290091 in words is "one hundred fifty-five million, two hundred ninety thousand, ninety-one".