253694161 has 4 divisors (see below), whose sum is σ = 289936192. Its totient is φ = 217452132.

The previous prime is 253694143. The next prime is 253694197. The reversal of 253694161 is 161496352.

253694161 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253694161 - 2¹³ = 253685969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 253694161.

It is not an unprimeable number, because it can be changed into a prime (253694561) 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, 18121005 + ... + 18121018.

It is an arithmetic number, because the mean of its divisors is an integer number (72484048).

Almost surely, 2^253694161 is an apocalyptic number.

It is an amenable number.

253694161 is a deficient number, since it is larger than the sum of its proper divisors (36242031).

253694161 is an equidigital number, since it uses as much as digits as its factorization.

253694161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36242030.

The product of its digits is 38880, while the sum is 37.

The square root of 253694161 is about 15927.7795376506. The cubic root of 253694161 is about 633.0482665075.

Adding to 253694161 its product of digits (38880), we get a square (253733041 = 15929²).

The spelling of 253694161 in words is "two hundred fifty-three million, six hundred ninety-four thousand, one hundred sixty-one".