290331391 has 8 divisors (see below), whose sum is σ = 337247264. Its totient is φ = 244775520.

The previous prime is 290331367. The next prime is 290331407. The reversal of 290331391 is 193133092.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 290331391 - 2¹⁹ = 289807103 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 (290334391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339540 + ... + 340393.

It is an arithmetic number, because the mean of its divisors is an integer number (42155908).

Almost surely, 2^290331391 is an apocalyptic number.

290331391 is a deficient number, since it is larger than the sum of its proper divisors (46915873).

290331391 is an equidigital number, since it uses as much as digits as its factorization.

290331391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680001.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 290331391 is about 17039.1135626241. The cubic root of 290331391 is about 662.1626266578.

The spelling of 290331391 in words is "two hundred ninety million, three hundred thirty-one thousand, three hundred ninety-one".