1283899746649 has 27 divisors (see below), whose sum is σ = 1424044329183. Its totient is φ = 1157005794672.

The previous prime is 1283899746617. The next prime is 1283899746659. The reversal of 1283899746649 is 9466479983821.

The square root of 1283899746649 is 1133093.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 189925998025 + 1093973748624 = 435805^2 + 1045932^2 .

It is not a de Polignac number, because 1283899746649 - 2⁵ = 1283899746617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1283899746659) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 633397974 + ... + 633400000.

Almost surely, 2^{1283899746649} is an apocalyptic number.

1283899746649 is the 1133093-rd square number.

1283899746649 is the 566547-th centered octagonal number.

It is an amenable number.

1283899746649 is a deficient number, since it is larger than the sum of its proper divisors (140144582534).

1283899746649 is an frugal number, since it uses more digits than its factorization.

1283899746649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4166 (or 2083 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 76.

The spelling of 1283899746649 in words is "one trillion, two hundred eighty-three billion, eight hundred ninety-nine million, seven hundred forty-six thousand, six hundred forty-nine".