256215233 has 2 divisors, whose sum is σ = 256215234. Its totient is φ = 256215232.

The previous prime is 256215163. The next prime is 256215251. The reversal of 256215233 is 332512652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252555664 + 3659569 = 15892^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 256215233 - 2¹⁰ = 256214209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256215196 and 256215205.

It is not a weakly prime, because it can be changed into another prime (256215263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128107616 + 128107617.

It is an arithmetic number, because the mean of its divisors is an integer number (128107617).

Almost surely, 2^256215233 is an apocalyptic number.

It is an amenable number.

256215233 is a deficient number, since it is larger than the sum of its proper divisors (1).

256215233 is an equidigital number, since it uses as much as digits as its factorization.

256215233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 29.

The square root of 256215233 is about 16006.7246181097. The cubic root of 256215233 is about 635.1383194250.

Adding to 256215233 its reverse (332512652), we get a palindrome (588727885).

The spelling of 256215233 in words is "two hundred fifty-six million, two hundred fifteen thousand, two hundred thirty-three".