349753991 has 4 divisors (see below), whose sum is σ = 349898232. Its totient is φ = 349609752.

The previous prime is 349753981. The next prime is 349753993. The reversal of 349753991 is 199357943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199357943 = 61 ⋅3268163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349753991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349753993) 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, 68420 + ... + 73353.

It is an arithmetic number, because the mean of its divisors is an integer number (87474558).

Almost surely, 2^349753991 is an apocalyptic number.

349753991 is a deficient number, since it is larger than the sum of its proper divisors (144241).

349753991 is a wasteful number, since it uses less digits than its factorization.

349753991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144240.

The product of its digits is 918540, while the sum is 50.

The square root of 349753991 is about 18701.7109110370. The cubic root of 349753991 is about 704.5647203238.

The spelling of 349753991 in words is "three hundred forty-nine million, seven hundred fifty-three thousand, nine hundred ninety-one".