155421311 has 8 divisors (see below), whose sum is σ = 164071920. Its totient is φ = 146817792.

The previous prime is 155421289. The next prime is 155421319. The reversal of 155421311 is 113124551.

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 155421311 - 2¹⁴ = 155404927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155421319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4880 + ... + 18293.

It is an arithmetic number, because the mean of its divisors is an integer number (20508990).

Almost surely, 2^155421311 is an apocalyptic number.

155421311 is a deficient number, since it is larger than the sum of its proper divisors (8650609).

155421311 is a wasteful number, since it uses less digits than its factorization.

155421311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23545.

The product of its digits is 600, while the sum is 23.

The square root of 155421311 is about 12466.8083726349. The cubic root of 155421311 is about 537.6547941403.

Adding to 155421311 its reverse (113124551), we get a palindrome (268545862).

The spelling of 155421311 in words is "one hundred fifty-five million, four hundred twenty-one thousand, three hundred eleven".