1261083897 has 20 divisors (see below), whose sum is σ = 1887832320. Its totient is φ = 838941624.

The previous prime is 1261083871. The next prime is 1261083907. The reversal of 1261083897 is 7983801621.

1261083897 is a `hidden beast` number, since 1 + 261 + 0 + 8 + 389 + 7 = 666.

It is not a de Polignac number, because 1261083897 - 2¹⁰ = 1261082873 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1261083847) 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 19 ways as a sum of consecutive naturals, for example, 22548 + ... + 55050.

It is an arithmetic number, because the mean of its divisors is an integer number (94391616).

Almost surely, 2^1261083897 is an apocalyptic number.

It is an amenable number.

1261083897 is a deficient number, since it is larger than the sum of its proper divisors (626748423).

1261083897 is an equidigital number, since it uses as much as digits as its factorization.

1261083897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32994 (or 32985 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1261083897 is about 35511.7430859146. The cubic root of 1261083897 is about 1080.3919179461.

The spelling of 1261083897 in words is "one billion, two hundred sixty-one million, eighty-three thousand, eight hundred ninety-seven".