155290243 has 4 divisors (see below), whose sum is σ = 158901688. Its totient is φ = 151678800.

The previous prime is 155290231. The next prime is 155290271. The reversal of 155290243 is 342092551.

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 155290243 - 2¹³ = 155282051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155290643) 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, 1805658 + ... + 1805743.

It is an arithmetic number, because the mean of its divisors is an integer number (39725422).

Almost surely, 2^155290243 is an apocalyptic number.

155290243 is a deficient number, since it is larger than the sum of its proper divisors (3611445).

155290243 is an equidigital number, since it uses as much as digits as its factorization.

155290243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611444.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 155290243 is about 12461.5505857016. The cubic root of 155290243 is about 537.5036154796.

The spelling of 155290243 in words is "one hundred fifty-five million, two hundred ninety thousand, two hundred forty-three".