155021441 has 4 divisors (see below), whose sum is σ = 155305392. Its totient is φ = 154737492.

The previous prime is 155021431. The next prime is 155021459. The reversal of 155021441 is 144120551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155021441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155021401) 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, 141155 + ... + 142248.

It is an arithmetic number, because the mean of its divisors is an integer number (38826348).

Almost surely, 2^155021441 is an apocalyptic number.

It is an amenable number.

155021441 is a deficient number, since it is larger than the sum of its proper divisors (283951).

155021441 is an equidigital number, since it uses as much as digits as its factorization.

155021441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283950.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 155021441 is about 12450.7606594939. The cubic root of 155021441 is about 537.1933030204.

Adding to 155021441 its reverse (144120551), we get a palindrome (299141992).

The spelling of 155021441 in words is "one hundred fifty-five million, twenty-one thousand, four hundred forty-one".