354691409 has 2 divisors, whose sum is σ = 354691410. Its totient is φ = 354691408.

The previous prime is 354691397. The next prime is 354691427. The reversal of 354691409 is 904196453.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224160784 + 130530625 = 14972^2 + 11425^2 .

It is a cyclic number.

It is not a de Polignac number, because 354691409 - 2⁸ = 354691153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (354691439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177345704 + 177345705.

It is an arithmetic number, because the mean of its divisors is an integer number (177345705).

Almost surely, 2^354691409 is an apocalyptic number.

It is an amenable number.

354691409 is a deficient number, since it is larger than the sum of its proper divisors (1).

354691409 is an equidigital number, since it uses as much as digits as its factorization.

354691409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 354691409 is about 18833.2527461403. The cubic root of 354691409 is about 707.8646475644.

The spelling of 354691409 in words is "three hundred fifty-four million, six hundred ninety-one thousand, four hundred nine".