151221145 has 8 divisors (see below), whose sum is σ = 181626120. Its totient is φ = 120869760.

The previous prime is 151221127. The next prime is 151221197. The reversal of 151221145 is 541122151.

It can be written as a sum of positive squares in 4 ways, for example, as 98962704 + 52258441 = 9948^2 + 7229^2 .

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

It is not a de Polignac number, because 151221145 - 2⁷ = 151221017 is a prime.

It is a super-2 number, since 2×151221145² = 45735669390222050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6900 + ... + 18709.

It is an arithmetic number, because the mean of its divisors is an integer number (22703265).

Almost surely, 2^151221145 is an apocalyptic number.

It is an amenable number.

151221145 is a deficient number, since it is larger than the sum of its proper divisors (30404975).

151221145 is a wasteful number, since it uses less digits than its factorization.

151221145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26795.

The product of its digits is 400, while the sum is 22.

The square root of 151221145 is about 12297.2006977198. The cubic root of 151221145 is about 532.7672341871.

Adding to 151221145 its reverse (541122151), we get a palindrome (692343296).

The spelling of 151221145 in words is "one hundred fifty-one million, two hundred twenty-one thousand, one hundred forty-five".