155121411 has 4 divisors (see below), whose sum is σ = 206828552. Its totient is φ = 103414272.

The previous prime is 155121403. The next prime is 155121433. The reversal of 155121411 is 114121551.

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

It is not a de Polignac number, because 155121411 - 2³ = 155121403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155121451) 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, 25853566 + ... + 25853571.

It is an arithmetic number, because the mean of its divisors is an integer number (51707138).

Almost surely, 2^155121411 is an apocalyptic number.

155121411 is a deficient number, since it is larger than the sum of its proper divisors (51707141).

155121411 is an equidigital number, since it uses as much as digits as its factorization.

155121411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51707140.

The product of its digits is 200, while the sum is 21.

The square root of 155121411 is about 12454.7746266241. The cubic root of 155121411 is about 537.3087530172.

Adding to 155121411 its reverse (114121551), we get a palindrome (269242962).

The spelling of 155121411 in words is "one hundred fifty-five million, one hundred twenty-one thousand, four hundred eleven".