1244904661 has 64 divisors (see below), whose sum is σ = 1724405760. Its totient is φ = 867605760.

The previous prime is 1244904649. The next prime is 1244904671. The reversal of 1244904661 is 1664094421.

It is not a de Polignac number, because 1244904661 - 2⁵ = 1244904629 is a prime.

It is a super-2 number, since 2×1244904661² = 3099575229959049842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1244904661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244904631) 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 63 ways as a sum of consecutive naturals, for example, 6319215 + ... + 6319411.

It is an arithmetic number, because the mean of its divisors is an integer number (26943840).

Almost surely, 2^1244904661 is an apocalyptic number.

1244904661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1244904661 is a deficient number, since it is larger than the sum of its proper divisors (479501099).

1244904661 is a wasteful number, since it uses less digits than its factorization.

1244904661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1244904661 is about 35283.2065011104. The cubic root of 1244904661 is about 1075.7516750390.

The spelling of 1244904661 in words is "one billion, two hundred forty-four million, nine hundred four thousand, six hundred sixty-one".