155211550 has 48 divisors (see below), whose sum is σ = 314511120. Its totient is φ = 56643840.

The previous prime is 155211499. The next prime is 155211557. The reversal of 155211550 is 55112551.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155211557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56509 + ... + 59191.

It is an arithmetic number, because the mean of its divisors is an integer number (6552315).

Almost surely, 2^155211550 is an apocalyptic number.

155211550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155211550 is an abundant number, since it is smaller than the sum of its proper divisors (159299570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155211550 is a wasteful number, since it uses less digits than its factorization.

155211550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797 (or 2792 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 155211550 is about 12458.3927534815. The cubic root of 155211550 is about 537.4128072013.

It can be divided in two parts, 15521 and 1550, that added together give a palindrome (17071).

The spelling of 155211550 in words is "one hundred fifty-five million, two hundred eleven thousand, five hundred fifty".