256033121 has 2 divisors, whose sum is σ = 256033122. Its totient is φ = 256033120.

The previous prime is 256033109. The next prime is 256033133. The reversal of 256033121 is 121330652.

It is a balanced prime because it is at equal distance from previous prime (256033109) and next prime (256033133).

It can be written as a sum of positive squares in only one way, i.e., 155251600 + 100781521 = 12460^2 + 10039^2 .

It is a cyclic number.

It is not a de Polignac number, because 256033121 - 2²² = 251838817 is a prime.

It is not a weakly prime, because it can be changed into another prime (256033181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128016560 + 128016561.

It is an arithmetic number, because the mean of its divisors is an integer number (128016561).

Almost surely, 2^256033121 is an apocalyptic number.

It is an amenable number.

256033121 is a deficient number, since it is larger than the sum of its proper divisors (1).

256033121 is an equidigital number, since it uses as much as digits as its factorization.

256033121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 256033121 is about 16001.0349977744. The cubic root of 256033121 is about 634.9878031013.

Adding to 256033121 its reverse (121330652), we get a palindrome (377363773).

The spelling of 256033121 in words is "two hundred fifty-six million, thirty-three thousand, one hundred twenty-one".