1244440091 has 4 divisors (see below), whose sum is σ = 1245575592. Its totient is φ = 1243304592.

The previous prime is 1244440039. The next prime is 1244440151. The reversal of 1244440091 is 1900444421.

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

It is a cyclic number.

It is not a de Polignac number, because 1244440091 - 2⁶ = 1244440027 is a prime.

It is a super-2 number, since 2×1244440091² = 3097262280176176562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1244440031) 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, 566105 + ... + 568298.

It is an arithmetic number, because the mean of its divisors is an integer number (311393898).

Almost surely, 2^1244440091 is an apocalyptic number.

1244440091 is a deficient number, since it is larger than the sum of its proper divisors (1135501).

1244440091 is a wasteful number, since it uses less digits than its factorization.

1244440091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135500.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1244440091 is about 35276.6224431988. The cubic root of 1244440091 is about 1075.6178430675.

The spelling of 1244440091 in words is "one billion, two hundred forty-four million, four hundred forty thousand, ninety-one".