151221144 has 64 divisors (see below), whose sum is σ = 386784000. Its totient is φ = 49256064.

The previous prime is 151221127. The next prime is 151221197. The reversal of 151221144 is 441122151.

It is a self number, because there is not a number n which added to its sum of digits gives 151221144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252157 + ... + 252755.

It is an arithmetic number, because the mean of its divisors is an integer number (6043500).

Almost surely, 2^151221144 is an apocalyptic number.

It is an amenable number.

151221144 is an abundant number, since it is smaller than the sum of its proper divisors (235562856).

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

151221144 is a wasteful number, since it uses less digits than its factorization.

151221144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 828 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 151221144 is about 12297.2006570601. The cubic root of 151221144 is about 532.7672330127.

Adding to 151221144 its reverse (441122151), we get a palindrome (592343295).

The spelling of 151221144 in words is "one hundred fifty-one million, two hundred twenty-one thousand, one hundred forty-four".