1261207849 has 24 divisors (see below), whose sum is σ = 1466202528. Its totient is φ = 1075683840.

The previous prime is 1261207841. The next prime is 1261207867. The reversal of 1261207849 is 9487021621.

It is not a de Polignac number, because 1261207849 - 2³ = 1261207841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261207841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1961122 + ... + 1961764.

It is an arithmetic number, because the mean of its divisors is an integer number (61091772).

Almost surely, 2^1261207849 is an apocalyptic number.

It is an amenable number.

1261207849 is a deficient number, since it is larger than the sum of its proper divisors (204994679).

1261207849 is a wasteful number, since it uses less digits than its factorization.

1261207849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1261207849 is about 35513.4882685438. The cubic root of 1261207849 is about 1080.4273140451.

The spelling of 1261207849 in words is "one billion, two hundred sixty-one million, two hundred seven thousand, eight hundred forty-nine".