155621272 has 16 divisors (see below), whose sum is σ = 291927600. Its totient is φ = 77773920.

The previous prime is 155621251. The next prime is 155621273. The reversal of 155621272 is 272126551.

It is a super-3 number, since 3×155621272³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621273) 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, 23622 + ... + 29482.

It is an arithmetic number, because the mean of its divisors is an integer number (18245475).

Almost surely, 2^155621272 is an apocalyptic number.

It is an amenable number.

155621272 is a deficient number, since it is larger than the sum of its proper divisors (136306328).

155621272 is a wasteful number, since it uses less digits than its factorization.

155621272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186 (or 9182 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 155621272 is about 12474.8255298421. The cubic root of 155621272 is about 537.8852728651.

The spelling of 155621272 in words is "one hundred fifty-five million, six hundred twenty-one thousand, two hundred seventy-two".