151445221 has 8 divisors (see below), whose sum is σ = 159625080. Its totient is φ = 143462592.

The previous prime is 151445213. The next prime is 151445243. The reversal of 151445221 is 122544151.

It can be written as a sum of positive squares in 4 ways, for example, as 55130625 + 96314596 = 7425^2 + 9814^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 151445221 - 2³ = 151445213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151443221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47730 + ... + 50803.

It is an arithmetic number, because the mean of its divisors is an integer number (19953135).

Almost surely, 2^151445221 is an apocalyptic number.

It is an amenable number.

151445221 is a deficient number, since it is larger than the sum of its proper divisors (8179859).

151445221 is an equidigital number, since it uses as much as digits as its factorization.

151445221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98615.

The product of its digits is 1600, while the sum is 25.

The square root of 151445221 is about 12306.3081791413. The cubic root of 151445221 is about 533.0302517129.

Adding to 151445221 its reverse (122544151), we get a palindrome (273989372).

The spelling of 151445221 in words is "one hundred fifty-one million, four hundred forty-five thousand, two hundred twenty-one".