155272550 has 12 divisors (see below), whose sum is σ = 288807036. Its totient is φ = 62109000.

The previous prime is 155272549. The next prime is 155272561. The reversal of 155272550 is 55272551.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1552676 + ... + 1552775.

It is an arithmetic number, because the mean of its divisors is an integer number (24067253).

Almost surely, 2^155272550 is an apocalyptic number.

155272550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155272550 is a deficient number, since it is larger than the sum of its proper divisors (133534486).

155272550 is a wasteful number, since it uses less digits than its factorization.

155272550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105463 (or 3105458 counting only the distinct ones).

The product of its (nonzero) digits is 17500, while the sum is 32.

The square root of 155272550 is about 12460.8406618494. The cubic root of 155272550 is about 537.4832012056.

Subtracting from 155272550 its reverse (55272551), we obtain a palindrome (99999999).

The spelling of 155272550 in words is "one hundred fifty-five million, two hundred seventy-two thousand, five hundred fifty".