354991999 has 2 divisors, whose sum is σ = 354992000. Its totient is φ = 354991998.

The previous prime is 354991957. The next prime is 354992083. The reversal of 354991999 is 999199453.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 354991999 - 2¹³ = 354983807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354991099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177495999 + 177496000.

It is an arithmetic number, because the mean of its divisors is an integer number (177496000).

Almost surely, 2^354991999 is an apocalyptic number.

354991999 is a deficient number, since it is larger than the sum of its proper divisors (1).

354991999 is an equidigital number, since it uses as much as digits as its factorization.

354991999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3542940, while the sum is 58.

The square root of 354991999 is about 18841.2313557262. The cubic root of 354991999 is about 708.0645555689.

The spelling of 354991999 in words is "three hundred fifty-four million, nine hundred ninety-one thousand, nine hundred ninety-nine".