1261823147 has 64 divisors (see below), whose sum is σ = 1567641600. Its totient is φ = 1004021760.

The previous prime is 1261823141. The next prime is 1261823159. The reversal of 1261823147 is 7413281621.

It is not a de Polignac number, because 1261823147 - 2⁶ = 1261823083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261823141) 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 63 ways as a sum of consecutive naturals, for example, 17772122 + ... + 17772192.

It is an arithmetic number, because the mean of its divisors is an integer number (24494400).

Almost surely, 2^1261823147 is an apocalyptic number.

1261823147 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1261823147 is a deficient number, since it is larger than the sum of its proper divisors (305818453).

1261823147 is a wasteful number, since it uses less digits than its factorization.

1261823147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236.

The product of its digits is 16128, while the sum is 35.

The square root of 1261823147 is about 35522.1500897679. The cubic root of 1261823147 is about 1080.6029860374.

The spelling of 1261823147 in words is "one billion, two hundred sixty-one million, eight hundred twenty-three thousand, one hundred forty-seven".