1244694861 has 12 divisors (see below), whose sum is σ = 1798940988. Its totient is φ = 829312704.

The previous prime is 1244694859. The next prime is 1244694863. The reversal of 1244694861 is 1684964421.

1244694861 is a `hidden beast` number, since 124 + 46 + 9 + 486 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1244694859) and next prime (1244694863).

It can be written as a sum of positive squares in 2 ways, for example, as 207532836 + 1037162025 = 14406^2 + 32205^2 .

It is not a de Polignac number, because 1244694861 - 2¹ = 1244694859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244694863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23670 + ... + 55223.

It is an arithmetic number, because the mean of its divisors is an integer number (149911749).

Almost surely, 2^1244694861 is an apocalyptic number.

It is an amenable number.

1244694861 is a deficient number, since it is larger than the sum of its proper divisors (554246127).

1244694861 is a wasteful number, since it uses less digits than its factorization.

1244694861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80652 (or 80649 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 1244694861 is about 35280.2332900450. The cubic root of 1244694861 is about 1075.6912405902.

The spelling of 1244694861 in words is "one billion, two hundred forty-four million, six hundred ninety-four thousand, eight hundred sixty-one".