354491639 has 2 divisors, whose sum is σ = 354491640. Its totient is φ = 354491638.

The previous prime is 354491611. The next prime is 354491773. The reversal of 354491639 is 936194453.

It is a weak prime.

It is an emirp because it is prime and its reverse (936194453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 354491639 - 2²⁰ = 353443063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 354491639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (354491609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177245819 + 177245820.

It is an arithmetic number, because the mean of its divisors is an integer number (177245820).

Almost surely, 2^354491639 is an apocalyptic number.

354491639 is a deficient number, since it is larger than the sum of its proper divisors (1).

354491639 is an equidigital number, since it uses as much as digits as its factorization.

354491639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 354491639 is about 18827.9483481340. The cubic root of 354491639 is about 707.7317276291.

The spelling of 354491639 in words is "three hundred fifty-four million, four hundred ninety-one thousand, six hundred thirty-nine".