393994245251 has 4 divisors (see below), whose sum is σ = 396195330600. Its totient is φ = 391793159904.

The previous prime is 393994245223. The next prime is 393994245257. The reversal of 393994245251 is 152542499393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 393994245251 - 2⁶ = 393994245187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393994245257) 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, 1100542406 + ... + 1100542763.

It is an arithmetic number, because the mean of its divisors is an integer number (99048832650).

Almost surely, 2^393994245251 is an apocalyptic number.

393994245251 is a deficient number, since it is larger than the sum of its proper divisors (2201085349).

393994245251 is a wasteful number, since it uses less digits than its factorization.

393994245251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201085348.

The product of its digits is 10497600, while the sum is 56.

The spelling of 393994245251 in words is "three hundred ninety-three billion, nine hundred ninety-four million, two hundred forty-five thousand, two hundred fifty-one".