1235085281 has 2 divisors, whose sum is σ = 1235085282. Its totient is φ = 1235085280.

The previous prime is 1235085251. The next prime is 1235085283. The reversal of 1235085281 is 1825805321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 865830625 + 369254656 = 29425^2 + 19216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1235085281 - 2⁶ = 1235085217 is a prime.

It is a super-2 number, since 2×1235085281² = 3050871302685697922, which contains 22 as substring.

Together with 1235085283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1235085283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617542640 + 617542641.

It is an arithmetic number, because the mean of its divisors is an integer number (617542641).

Almost surely, 2^1235085281 is an apocalyptic number.

It is an amenable number.

1235085281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235085281 is an equidigital number, since it uses as much as digits as its factorization.

1235085281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 1235085281 is about 35143.7801182514. The cubic root of 1235085281 is about 1072.9158193675.

The spelling of 1235085281 in words is "one billion, two hundred thirty-five million, eighty-five thousand, two hundred eighty-one".