349491681 has 108 divisors (see below), whose sum is σ = 674558976. Its totient is φ = 170644320.

The previous prime is 349491619. The next prime is 349491689. The reversal of 349491681 is 186194943.

It is not a de Polignac number, because 349491681 - 2⁶ = 349491617 is a prime.

It is a super-2 number, since 2×349491681² = 244288870176411522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349491689) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2751840 + ... + 2751966.

Almost surely, 2^349491681 is an apocalyptic number.

It is an amenable number.

349491681 is a deficient number, since it is larger than the sum of its proper divisors (325067295).

349491681 is a wasteful number, since it uses less digits than its factorization.

349491681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 167 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 349491681 is about 18694.6966009080. The cubic root of 349491681 is about 704.3885387806.

The spelling of 349491681 in words is "three hundred forty-nine million, four hundred ninety-one thousand, six hundred eighty-one".