340631991 has 48 divisors (see below), whose sum is σ = 576296448. Its totient is φ = 189864000.

The previous prime is 340631989. The next prime is 340632031. The reversal of 340631991 is 199136043.

It is not a de Polignac number, because 340631991 - 2¹ = 340631989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340631191) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 580000 + ... + 580586.

It is an arithmetic number, because the mean of its divisors is an integer number (12006176).

Almost surely, 2^340631991 is an apocalyptic number.

340631991 is a deficient number, since it is larger than the sum of its proper divisors (235664457).

340631991 is a wasteful number, since it uses less digits than its factorization.

340631991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 340631991 is about 18456.2182204264. The cubic root of 340631991 is about 698.3853881423.

The spelling of 340631991 in words is "three hundred forty million, six hundred thirty-one thousand, nine hundred ninety-one".