155042023 has 4 divisors (see below), whose sum is σ = 164162160. Its totient is φ = 145921888.

The previous prime is 155042009. The next prime is 155042039. The reversal of 155042023 is 320240551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320240551 = 199 ⋅1609249.

It is a cyclic number.

It is not a de Polignac number, because 155042023 - 2¹³ = 155033831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155041985 and 155042003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155012023) 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, 4560043 + ... + 4560076.

It is an arithmetic number, because the mean of its divisors is an integer number (41040540).

Almost surely, 2^155042023 is an apocalyptic number.

155042023 is a deficient number, since it is larger than the sum of its proper divisors (9120137).

155042023 is an equidigital number, since it uses as much as digits as its factorization.

155042023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120136.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 155042023 is about 12451.5871679076. The cubic root of 155042023 is about 537.2170761260.

Adding to 155042023 its reverse (320240551), we get a palindrome (475282574).

The spelling of 155042023 in words is "one hundred fifty-five million, forty-two thousand, twenty-three".