155434121 has 4 divisors (see below), whose sum is σ = 159048912. Its totient is φ = 151819332.

The previous prime is 155434091. The next prime is 155434127. The reversal of 155434121 is 121434551.

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 not a de Polignac number, because 155434121 - 2⁶ = 155434057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155434127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807331 + ... + 1807416.

It is an arithmetic number, because the mean of its divisors is an integer number (39762228).

Almost surely, 2^155434121 is an apocalyptic number.

It is an amenable number.

155434121 is a deficient number, since it is larger than the sum of its proper divisors (3614791).

155434121 is an equidigital number, since it uses as much as digits as its factorization.

155434121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614790.

The product of its digits is 2400, while the sum is 26.

The square root of 155434121 is about 12467.3221262627. The cubic root of 155434121 is about 537.6695651063.

Adding to 155434121 its reverse (121434551), we get a palindrome (276868672).

The spelling of 155434121 in words is "one hundred fifty-five million, four hundred thirty-four thousand, one hundred twenty-one".