253421691 has 8 divisors (see below), whose sum is σ = 349547280. Its totient is φ = 163121952.

The previous prime is 253421687. The next prime is 253421699. The reversal of 253421691 is 196124352.

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

It is not a de Polignac number, because 253421691 - 2² = 253421687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253421699) 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, 1456360 + ... + 1456533.

It is an arithmetic number, because the mean of its divisors is an integer number (43693410).

Almost surely, 2^253421691 is an apocalyptic number.

253421691 is a deficient number, since it is larger than the sum of its proper divisors (96125589).

253421691 is a wasteful number, since it uses less digits than its factorization.

253421691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912925.

The product of its digits is 12960, while the sum is 33.

The square root of 253421691 is about 15919.2239446526. The cubic root of 253421691 is about 632.8215519888.

The spelling of 253421691 in words is "two hundred fifty-three million, four hundred twenty-one thousand, six hundred ninety-one".