152228381 has 4 divisors (see below), whose sum is σ = 152557632. Its totient is φ = 151899132.

The previous prime is 152228369. The next prime is 152228389. The reversal of 152228381 is 183822251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183822251 = 4289 ⋅42859.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-152228381 is a prime.

It is a super-3 number, since 3×152228381³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152228389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163931 + ... + 164856.

It is an arithmetic number, because the mean of its divisors is an integer number (38139408).

Almost surely, 2^152228381 is an apocalyptic number.

It is an amenable number.

152228381 is a deficient number, since it is larger than the sum of its proper divisors (329251).

152228381 is an equidigital number, since it uses as much as digits as its factorization.

152228381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329250.

The product of its digits is 7680, while the sum is 32.

The square root of 152228381 is about 12338.0866020627. The cubic root of 152228381 is about 533.9474820585.

The spelling of 152228381 in words is "one hundred fifty-two million, two hundred twenty-eight thousand, three hundred eighty-one".