151385221 has 8 divisors (see below), whose sum is σ = 172620504. Its totient is φ = 131520000.

The previous prime is 151385203. The next prime is 151385237. The reversal of 151385221 is 122583151.

It can be written as a sum of positive squares in 4 ways, for example, as 4708900 + 146676321 = 2170^2 + 12111^2 .

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 151385221 - 2¹¹ = 151383173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151385221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151385291) 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, 342280 + ... + 342721.

It is an arithmetic number, because the mean of its divisors is an integer number (21577563).

Almost surely, 2^151385221 is an apocalyptic number.

It is an amenable number.

151385221 is a deficient number, since it is larger than the sum of its proper divisors (21235283).

151385221 is a wasteful number, since it uses less digits than its factorization.

151385221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685031.

The product of its digits is 2400, while the sum is 28.

The square root of 151385221 is about 12303.8701634892. The cubic root of 151385221 is about 532.9598499325.

The spelling of 151385221 in words is "one hundred fifty-one million, three hundred eighty-five thousand, two hundred twenty-one".