253853561 has 4 divisors (see below), whose sum is σ = 273380772. Its totient is φ = 234326352.

The previous prime is 253853531. The next prime is 253853563. The reversal of 253853561 is 165358352.

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 149915536 + 103938025 = 12244^2 + 10195^2 .

It is not a de Polignac number, because 253853561 - 2⁶ = 253853497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253853563) 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, 9763586 + ... + 9763611.

It is an arithmetic number, because the mean of its divisors is an integer number (68345193).

Almost surely, 2^253853561 is an apocalyptic number.

It is an amenable number.

253853561 is a deficient number, since it is larger than the sum of its proper divisors (19527211).

253853561 is a wasteful number, since it uses less digits than its factorization.

253853561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19527210.

The product of its digits is 108000, while the sum is 38.

The square root of 253853561 is about 15932.7825881106. The cubic root of 253853561 is about 633.1808234502.

The spelling of 253853561 in words is "two hundred fifty-three million, eight hundred fifty-three thousand, five hundred sixty-one".