354691970209 has 4 divisors (see below), whose sum is σ = 357830837316. Its totient is φ = 351553103104.

The previous prime is 354691970137. The next prime is 354691970221. The reversal of 354691970209 is 902079196453.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902079196453 = 103 ⋅8758050451.

It can be written as a sum of positive squares in 2 ways, for example, as 32695872400 + 321996097809 = 180820^2 + 567447^2 .

It is not a de Polignac number, because 354691970209 - 2¹⁵ = 354691937441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 354691970209.

It is not an unprimeable number, because it can be changed into a prime (354691970309) 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, 1569433384 + ... + 1569433609.

It is an arithmetic number, because the mean of its divisors is an integer number (89457709329).

Almost surely, 2^354691970209 is an apocalyptic number.

It is an amenable number.

354691970209 is a deficient number, since it is larger than the sum of its proper divisors (3138867107).

354691970209 is a wasteful number, since it uses less digits than its factorization.

354691970209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138867106.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 354691970209 in words is "three hundred fifty-four billion, six hundred ninety-one million, nine hundred seventy thousand, two hundred nine".