253985761 has 8 divisors (see below), whose sum is σ = 261690344. Its totient is φ = 246395520.

The previous prime is 253985747. The next prime is 253985777. The reversal of 253985761 is 167589352.

253985761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4977361 + 249008400 = 2231^2 + 15780^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253985761 - 2²⁵ = 220431329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253985701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24066 + ... + 32971.

It is an arithmetic number, because the mean of its divisors is an integer number (32711293).

Almost surely, 2^253985761 is an apocalyptic number.

It is an amenable number.

253985761 is a deficient number, since it is larger than the sum of its proper divisors (7704583).

253985761 is an equidigital number, since it uses as much as digits as its factorization.

253985761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57171.

The product of its digits is 453600, while the sum is 46.

The square root of 253985761 is about 15936.9307270879. The cubic root of 253985761 is about 633.2907188009.

The spelling of 253985761 in words is "two hundred fifty-three million, nine hundred eighty-five thousand, seven hundred sixty-one".