151811220 has 48 divisors (see below), whose sum is σ = 463716288. Its totient is φ = 36802560.

The previous prime is 151811203. The next prime is 151811221. The reversal of 151811220 is 22118151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151811221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 114349 + ... + 115668.

It is an arithmetic number, because the mean of its divisors is an integer number (9660756).

Almost surely, 2^151811220 is an apocalyptic number.

151811220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

151811220 is an abundant number, since it is smaller than the sum of its proper divisors (311905068).

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

151811220 is a wasteful number, since it uses less digits than its factorization.

151811220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230040 (or 230038 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 151811220 is about 12321.1695873403. The cubic root of 151811220 is about 533.4592992393.

Adding to 151811220 its reverse (22118151), we get a palindrome (173929371).

The spelling of 151811220 in words is "one hundred fifty-one million, eight hundred eleven thousand, two hundred twenty".