355243891 has 2 divisors, whose sum is σ = 355243892. Its totient is φ = 355243890.

The previous prime is 355243879. The next prime is 355243943. The reversal of 355243891 is 198342553.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 355243891 - 2⁵ = 355243859 is a prime.

It is not a weakly prime, because it can be changed into another prime (355243841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177621945 + 177621946.

It is an arithmetic number, because the mean of its divisors is an integer number (177621946).

Almost surely, 2^355243891 is an apocalyptic number.

355243891 is a deficient number, since it is larger than the sum of its proper divisors (1).

355243891 is an equidigital number, since it uses as much as digits as its factorization.

355243891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 355243891 is about 18847.9147652996. The cubic root of 355243891 is about 708.2319899795.

The spelling of 355243891 in words is "three hundred fifty-five million, two hundred forty-three thousand, eight hundred ninety-one".