1261202849 has 4 divisors (see below), whose sum is σ = 1261328064. Its totient is φ = 1261077636.

The previous prime is 1261202809. The next prime is 1261202869. The reversal of 1261202849 is 9482021621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261202849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261202809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46037 + ... + 68130.

It is an arithmetic number, because the mean of its divisors is an integer number (315332016).

Almost surely, 2^1261202849 is an apocalyptic number.

It is an amenable number.

1261202849 is a deficient number, since it is larger than the sum of its proper divisors (125215).

1261202849 is a wasteful number, since it uses less digits than its factorization.

1261202849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125214.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1261202849 is about 35513.4178726858. The cubic root of 1261202849 is about 1080.4258862753.

The spelling of 1261202849 in words is "one billion, two hundred sixty-one million, two hundred two thousand, eight hundred forty-nine".