155211450 has 48 divisors (see below), whose sum is σ = 391257696. Its totient is φ = 40708800.

The previous prime is 155211449. The next prime is 155211457. The reversal of 155211450 is 54112551.

It is a super-2 number, since 2×155211450² = 48181188422205000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155211450.

It is not an unprimeable number, because it can be changed into a prime (155211457) 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, 669 + ... + 17631.

It is an arithmetic number, because the mean of its divisors is an integer number (8151202).

Almost surely, 2^155211450 is an apocalyptic number.

155211450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155211450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195628848).

155211450 is an abundant number, since it is smaller than the sum of its proper divisors (236046246).

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

155211450 is a wasteful number, since it uses less digits than its factorization.

155211450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17039 (or 17034 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 155211450 is about 12458.3887401221. The cubic root of 155211450 is about 537.4126917861.

The spelling of 155211450 in words is "one hundred fifty-five million, two hundred eleven thousand, four hundred fifty".