1244506861 has 8 divisors (see below), whose sum is σ = 1341441080. Its totient is φ = 1147744512.

The previous prime is 1244506853. The next prime is 1244506871. The reversal of 1244506861 is 1686054421.

It can be written as a sum of positive squares in 4 ways, for example, as 47692836 + 1196814025 = 6906^2 + 34595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1244506861 - 2³ = 1244506853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1244506861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244506801) 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 7 ways as a sum of consecutive naturals, for example, 27720 + ... + 57073.

It is an arithmetic number, because the mean of its divisors is an integer number (167680135).

Almost surely, 2^1244506861 is an apocalyptic number.

It is an amenable number.

1244506861 is a deficient number, since it is larger than the sum of its proper divisors (96934219).

1244506861 is a wasteful number, since it uses less digits than its factorization.

1244506861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85935.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1244506861 is about 35277.5688079550. The cubic root of 1244506861 is about 1075.6370800238.

The spelling of 1244506861 in words is "one billion, two hundred forty-four million, five hundred six thousand, eight hundred sixty-one".