253909981 has 8 divisors (see below), whose sum is σ = 278076960. Its totient is φ = 230405232.

The previous prime is 253909937. The next prime is 253910009. The reversal of 253909981 is 189909352.

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 253909981 - 2⁷ = 253909853 is a prime.

It is a super-2 number, since 2×253909981² = 128940556902840722, 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 (253900981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164755 + ... + 166288.

It is an arithmetic number, because the mean of its divisors is an integer number (34759620).

Almost surely, 2^253909981 is an apocalyptic number.

It is an amenable number.

253909981 is a deficient number, since it is larger than the sum of its proper divisors (24166979).

253909981 is a wasteful number, since it uses less digits than its factorization.

253909981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331115.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 253909981 is about 15934.5530530354. The cubic root of 253909981 is about 633.2277289911.

The spelling of 253909981 in words is "two hundred fifty-three million, nine hundred nine thousand, nine hundred eighty-one".