349143428917 has 4 divisors (see below), whose sum is σ = 367519398880. Its totient is φ = 330767458956.

The previous prime is 349143428911. The next prime is 349143428923. The reversal of 349143428917 is 719824341943.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 719824341943 = 7 ⋅102832048849.

It is an interprime number because it is at equal distance from previous prime (349143428911) and next prime (349143428923).

It is a cyclic number.

It is not a de Polignac number, because 349143428917 - 2²⁷ = 349009211189 is a prime.

It is a super-2 number, since 2×349143428917² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349143428911) 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, 9187984953 + ... + 9187984990.

It is an arithmetic number, because the mean of its divisors is an integer number (91879849720).

Almost surely, 2^349143428917 is an apocalyptic number.

It is an amenable number.

349143428917 is a deficient number, since it is larger than the sum of its proper divisors (18375969963).

349143428917 is a wasteful number, since it uses less digits than its factorization.

349143428917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18375969962.

The product of its digits is 5225472, while the sum is 55.

The spelling of 349143428917 in words is "three hundred forty-nine billion, one hundred forty-three million, four hundred twenty-eight thousand, nine hundred seventeen".