1291493049 has 24 divisors (see below), whose sum is σ = 2185237728. Its totient is φ = 670904640.

The previous prime is 1291493039. The next prime is 1291493087. The reversal of 1291493049 is 9403941921.

It is not a de Polignac number, because 1291493049 - 2⁹ = 1291492537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291493049.

It is not an unprimeable number, because it can be changed into a prime (1291493039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397732 + ... + 400965.

It is an arithmetic number, because the mean of its divisors is an integer number (91051572).

Almost surely, 2^1291493049 is an apocalyptic number.

It is an amenable number.

1291493049 is a deficient number, since it is larger than the sum of its proper divisors (893744679).

1291493049 is a wasteful number, since it uses less digits than its factorization.

1291493049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798725 (or 798718 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 1291493049 is about 35937.3489422912. The cubic root of 1291493049 is about 1089.0070493278.

The spelling of 1291493049 in words is "one billion, two hundred ninety-one million, four hundred ninety-three thousand, forty-nine".