342991 has 4 divisors (see below), whose sum is σ = 374184. Its totient is φ = 311800.

The previous prime is 342989. The next prime is 343019. The reversal of 342991 is 199243.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 342991 - 2¹ = 342989 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 (342971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15580 + ... + 15601.

It is an arithmetic number, because the mean of its divisors is an integer number (93546).

342991 is a Friedman number, since it can be written as (49+21)^3-9, using all its digits and the basic arithmetic operations.

2³⁴²⁹⁹¹ is an apocalyptic number.

342991 is a deficient number, since it is larger than the sum of its proper divisors (31193).

342991 is a wasteful number, since it uses less digits than its factorization.

342991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31192.

The product of its digits is 1944, while the sum is 28.

The square root of 342991 is about 585.6543349110. The cubic root of 342991 is about 69.9993877497. Note that the first 3 decimals are identical.

It can be divided in two parts, 34 and 2991, that added together give a square (3025 = 55²).

The spelling of 342991 in words is "three hundred forty-two thousand, nine hundred ninety-one".