155164321 has 8 divisors (see below), whose sum is σ = 176929704. Its totient is φ = 134803200.

The previous prime is 155164319. The next prime is 155164351. The reversal of 155164321 is 123461551.

It can be written as a sum of positive squares in 4 ways, for example, as 435600 + 154728721 = 660^2 + 12439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155164321 - 2¹ = 155164319 is a prime.

It is a super-2 number, since 2×155164321² = 48151933022782082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155164321.

It is not an unprimeable number, because it can be changed into a prime (155164301) 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, 350830 + ... + 351271.

It is an arithmetic number, because the mean of its divisors is an integer number (22116213).

Almost surely, 2^155164321 is an apocalyptic number.

It is an amenable number.

155164321 is a deficient number, since it is larger than the sum of its proper divisors (21765383).

155164321 is a wasteful number, since it uses less digits than its factorization.

155164321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702131.

The product of its digits is 3600, while the sum is 28.

The square root of 155164321 is about 12456.4971400470. The cubic root of 155164321 is about 537.3582922627.

The spelling of 155164321 in words is "one hundred fifty-five million, one hundred sixty-four thousand, three hundred twenty-one".