1212091 has 4 divisors (see below), whose sum is σ = 1225800. Its totient is φ = 1198384.

The previous prime is 1212061. The next prime is 1212103. The reversal of 1212091 is 1902121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1902121 = 13 ⋅146317.

It is a cyclic number.

It is not a de Polignac number, because 1212091 - 2¹³ = 1203899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212011) 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, 6721 + ... + 6898.

It is an arithmetic number, because the mean of its divisors is an integer number (306450).

2^1212091 is an apocalyptic number.

1212091 is a deficient number, since it is larger than the sum of its proper divisors (13709).

1212091 is an equidigital number, since it uses as much as digits as its factorization.

1212091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13708.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1212091 is about 1100.9500442799. The cubic root of 1212091 is about 106.6215705639.

The spelling of 1212091 in words is "one million, two hundred twelve thousand, ninety-one".