226021157 has 4 divisors (see below), whose sum is σ = 233815020. Its totient is φ = 218227296.

The previous prime is 226021139. The next prime is 226021163. The reversal of 226021157 is 751120622.

It is a Cunningham number, because it is equal to 15034²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118504996 + 107516161 = 10886^2 + 10369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-226021157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (226021457) 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, 3896888 + ... + 3896945.

It is an arithmetic number, because the mean of its divisors is an integer number (58453755).

Almost surely, 2^226021157 is an apocalyptic number.

It is an amenable number.

226021157 is a deficient number, since it is larger than the sum of its proper divisors (7793863).

226021157 is an equidigital number, since it uses as much as digits as its factorization.

226021157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7793862.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 226021157 is about 15034.0000332579. Note that the first 4 decimals coincide. The cubic root of 226021157 is about 609.1389418954.

Adding to 226021157 its reverse (751120622), we get a palindrome (977141779).

The spelling of 226021157 in words is "two hundred twenty-six million, twenty-one thousand, one hundred fifty-seven".