253791391 has 16 divisors (see below), whose sum is σ = 296697600. Its totient is φ = 212591808.

The previous prime is 253791367. The next prime is 253791427. The reversal of 253791391 is 193197352.

253791391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 253791391 - 2⁹ = 253790879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253791331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72211 + ... + 75643.

It is an arithmetic number, because the mean of its divisors is an integer number (18543600).

Almost surely, 2^253791391 is an apocalyptic number.

253791391 is a deficient number, since it is larger than the sum of its proper divisors (42906209).

253791391 is a wasteful number, since it uses less digits than its factorization.

253791391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678.

The product of its digits is 51030, while the sum is 40.

The square root of 253791391 is about 15930.8314597826. The cubic root of 253791391 is about 633.1291295187.

The spelling of 253791391 in words is "two hundred fifty-three million, seven hundred ninety-one thousand, three hundred ninety-one".