351868993 has 4 divisors (see below), whose sum is σ = 402136000. Its totient is φ = 301601988.

The previous prime is 351868987. The next prime is 351868997. The reversal of 351868993 is 399868153.

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 351868993 - 2¹³ = 351860801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 351868993.

It is not an unprimeable number, because it can be changed into a prime (351868997) 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, 25133493 + ... + 25133506.

It is an arithmetic number, because the mean of its divisors is an integer number (100534000).

Almost surely, 2^351868993 is an apocalyptic number.

It is an amenable number.

351868993 is a deficient number, since it is larger than the sum of its proper divisors (50267007).

351868993 is an equidigital number, since it uses as much as digits as its factorization.

351868993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50267006.

The product of its digits is 1399680, while the sum is 52.

The square root of 351868993 is about 18758.1713661007. The cubic root of 351868993 is about 705.9820614338.

The spelling of 351868993 in words is "three hundred fifty-one million, eight hundred sixty-eight thousand, nine hundred ninety-three".