228121751 has 32 divisors (see below), whose sum is σ = 286336512. Its totient is φ = 178738560.

The previous prime is 228121741. The next prime is 228121757. The reversal of 228121751 is 157121822.

It is not a de Polignac number, because 228121751 - 2¹⁸ = 227859607 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228121757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140621 + ... + 142233.

It is an arithmetic number, because the mean of its divisors is an integer number (8948016).

Almost surely, 2^228121751 is an apocalyptic number.

228121751 is a deficient number, since it is larger than the sum of its proper divisors (58214761).

228121751 is a wasteful number, since it uses less digits than its factorization.

228121751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703.

The product of its digits is 2240, while the sum is 29.

The square root of 228121751 is about 15103.6999109490. The cubic root of 228121751 is about 611.0201964282.

The spelling of 228121751 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, seven hundred fifty-one".