155474321 has 4 divisors (see below), whose sum is σ = 163657200. Its totient is φ = 147291444.

The previous prime is 155474311. The next prime is 155474323. The reversal of 155474321 is 123474551.

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-155474321 is a prime.

It is a super-2 number, since 2×155474321² = 48344528980822082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155474323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4091411 + ... + 4091448.

It is an arithmetic number, because the mean of its divisors is an integer number (40914300).

Almost surely, 2^155474321 is an apocalyptic number.

It is an amenable number.

155474321 is a deficient number, since it is larger than the sum of its proper divisors (8182879).

155474321 is an equidigital number, since it uses as much as digits as its factorization.

155474321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182878.

The product of its digits is 16800, while the sum is 32.

The square root of 155474321 is about 12468.9342367341. The cubic root of 155474321 is about 537.7159136885.

The spelling of 155474321 in words is "one hundred fifty-five million, four hundred seventy-four thousand, three hundred twenty-one".