290911421 has 4 divisors (see below), whose sum is σ = 291602844. Its totient is φ = 290220000.

The previous prime is 290911399. The next prime is 290911433. The reversal of 290911421 is 124119092.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22934521 + 267976900 = 4789^2 + 16370^2 .

It is a cyclic number.

It is not a de Polignac number, because 290911421 - 2¹⁴ = 290895037 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 (290911121) 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 3 ways as a sum of consecutive naturals, for example, 345080 + ... + 345921.

It is an arithmetic number, because the mean of its divisors is an integer number (72900711).

Almost surely, 2^290911421 is an apocalyptic number.

It is an amenable number.

290911421 is a deficient number, since it is larger than the sum of its proper divisors (691423).

290911421 is an equidigital number, since it uses as much as digits as its factorization.

290911421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691422.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 290911421 is about 17056.1256151566. The cubic root of 290911421 is about 662.6032940163.

The spelling of 290911421 in words is "two hundred ninety million, nine hundred eleven thousand, four hundred twenty-one".