235205681 has 2 divisors, whose sum is σ = 235205682. Its totient is φ = 235205680.

The previous prime is 235205647. The next prime is 235205687. The reversal of 235205681 is 186502532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231040000 + 4165681 = 15200^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 235205681 - 2¹⁸ = 234943537 is a prime.

It is a super-2 number, since 2×235205681² = 110643424749347522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (235205687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117602840 + 117602841.

It is an arithmetic number, because the mean of its divisors is an integer number (117602841).

Almost surely, 2^235205681 is an apocalyptic number.

It is an amenable number.

235205681 is a deficient number, since it is larger than the sum of its proper divisors (1).

235205681 is an equidigital number, since it uses as much as digits as its factorization.

235205681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 235205681 is about 15336.4168240173. The cubic root of 235205681 is about 617.2805634651.

The spelling of 235205681 in words is "two hundred thirty-five million, two hundred five thousand, six hundred eighty-one".