253867781 has 4 divisors (see below), whose sum is σ = 254087232. Its totient is φ = 253648332.

The previous prime is 253867751. The next prime is 253867819. The reversal of 253867781 is 187768352.

It is a happy number.

253867781 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 253867781 - 2⁶ = 253867717 is a prime.

It is a super-2 number, since 2×253867781² = 128897700459727922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253867751) 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, 107981 + ... + 110306.

It is an arithmetic number, because the mean of its divisors is an integer number (63521808).

Almost surely, 2^253867781 is an apocalyptic number.

It is an amenable number.

253867781 is a deficient number, since it is larger than the sum of its proper divisors (219451).

253867781 is a wasteful number, since it uses less digits than its factorization.

253867781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219450.

The product of its digits is 564480, while the sum is 47.

The square root of 253867781 is about 15933.2288315959. The cubic root of 253867781 is about 633.1926460972.

The spelling of 253867781 in words is "two hundred fifty-three million, eight hundred sixty-seven thousand, seven hundred eighty-one".