1242291 has 4 divisors (see below), whose sum is σ = 1656392. Its totient is φ = 828192.

The previous prime is 1242289. The next prime is 1242317. The reversal of 1242291 is 1922421.

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

It is not a de Polignac number, because 1242291 - 2¹ = 1242289 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242221) 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, 207046 + ... + 207051.

It is an arithmetic number, because the mean of its divisors is an integer number (414098).

2^1242291 is an apocalyptic number.

1242291 is a deficient number, since it is larger than the sum of its proper divisors (414101).

1242291 is an equidigital number, since it uses as much as digits as its factorization.

1242291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414100.

The product of its digits is 288, while the sum is 21.

The square root of 1242291 is about 1114.5810872252. The cubic root of 1242291 is about 107.4998305388.

It can be divided in two parts, 124 and 2291, that added together give a triangular number (2415 = T₆₉).

The spelling of 1242291 in words is "one million, two hundred forty-two thousand, two hundred ninety-one".