290249321 has 4 divisors (see below), whose sum is σ = 291165252. Its totient is φ = 289333392.

The previous prime is 290249251. The next prime is 290249341. The reversal of 290249321 is 123942092.

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 15054400 + 275194921 = 3880^2 + 16589^2 .

It is a cyclic number.

It is not a de Polignac number, because 290249321 - 2²² = 286055017 is a prime.

It is a super-2 number, since 2×290249321² = 168489336681922082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290249341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457490 + ... + 458123.

It is an arithmetic number, because the mean of its divisors is an integer number (72791313).

Almost surely, 2^290249321 is an apocalyptic number.

It is an amenable number.

290249321 is a deficient number, since it is larger than the sum of its proper divisors (915931).

290249321 is an equidigital number, since it uses as much as digits as its factorization.

290249321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915930.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 290249321 is about 17036.7051098503. The cubic root of 290249321 is about 662.1002280680.

The spelling of 290249321 in words is "two hundred ninety million, two hundred forty-nine thousand, three hundred twenty-one".