155234321 has 8 divisors (see below), whose sum is σ = 169565088. Its totient is φ = 140940000.

The previous prime is 155234269. The next prime is 155234333. The reversal of 155234321 is 123432551.

It is a happy number.

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 155234321 - 2¹⁸ = 154972177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155234381) 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, 221 + ... + 17621.

It is an arithmetic number, because the mean of its divisors is an integer number (21195636).

Almost surely, 2^155234321 is an apocalyptic number.

155234321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155234321 is a deficient number, since it is larger than the sum of its proper divisors (14330767).

155234321 is a wasteful number, since it uses less digits than its factorization.

155234321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18223.

The product of its digits is 3600, while the sum is 26.

The square root of 155234321 is about 12459.3066018940. The cubic root of 155234321 is about 537.4390870940.

Adding to 155234321 its reverse (123432551), we get a palindrome (278666872).

The spelling of 155234321 in words is "one hundred fifty-five million, two hundred thirty-four thousand, three hundred twenty-one".