235813681 has 4 divisors (see below), whose sum is σ = 249685092. Its totient is φ = 221942272.

The previous prime is 235813667. The next prime is 235813709. The reversal of 235813681 is 186318532.

235813681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 86583025 + 149230656 = 9305^2 + 12216^2 .

It is a cyclic number.

It is not a de Polignac number, because 235813681 - 2²¹ = 233716529 is a prime.

It is a super-2 number, since 2×235813681² = 111216184293539522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 235813681.

It is not an unprimeable number, because it can be changed into a prime (235813601) 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, 6935680 + ... + 6935713.

It is an arithmetic number, because the mean of its divisors is an integer number (62421273).

Almost surely, 2^235813681 is an apocalyptic number.

It is an amenable number.

235813681 is a deficient number, since it is larger than the sum of its proper divisors (13871411).

235813681 is a wasteful number, since it uses less digits than its factorization.

235813681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13871410.

The product of its digits is 34560, while the sum is 37.

The square root of 235813681 is about 15356.2261314426. The cubic root of 235813681 is about 617.8119900573.

The spelling of 235813681 in words is "two hundred thirty-five million, eight hundred thirteen thousand, six hundred eighty-one".