228131515 has 4 divisors (see below), whose sum is σ = 273757824. Its totient is φ = 182505208.

The previous prime is 228131479. The next prime is 228131543. The reversal of 228131515 is 515131822.

228131515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228131515 - 2¹¹ = 228129467 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22813147 + ... + 22813156.

It is an arithmetic number, because the mean of its divisors is an integer number (68439456).

Almost surely, 2^228131515 is an apocalyptic number.

228131515 is a deficient number, since it is larger than the sum of its proper divisors (45626309).

228131515 is an equidigital number, since it uses as much as digits as its factorization.

228131515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45626308.

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

The square root of 228131515 is about 15104.0231395480. The cubic root of 228131515 is about 611.0289138727.

The spelling of 228131515 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, five hundred fifteen".