349123591 has 4 divisors (see below), whose sum is σ = 355041000. Its totient is φ = 343206184.

The previous prime is 349123589. The next prime is 349123603. The reversal of 349123591 is 195321943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195321943 = 1087 ⋅179689.

It is a cyclic number.

It is not a de Polignac number, because 349123591 - 2¹ = 349123589 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 349123591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349123501) 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, 2958616 + ... + 2958733.

It is an arithmetic number, because the mean of its divisors is an integer number (88760250).

Almost surely, 2^349123591 is an apocalyptic number.

349123591 is a deficient number, since it is larger than the sum of its proper divisors (5917409).

349123591 is an equidigital number, since it uses as much as digits as its factorization.

349123591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917408.

The product of its digits is 29160, while the sum is 37.

The square root of 349123591 is about 18684.8492367479. The cubic root of 349123591 is about 704.1411609745.

It can be divided in two parts, 34912 and 3591, that added together give a triangular number (38503 = T₂₇₇).

The spelling of 349123591 in words is "three hundred forty-nine million, one hundred twenty-three thousand, five hundred ninety-one".