1261546013 has 48 divisors (see below), whose sum is σ = 1692021744. Its totient is φ = 928972800.

The previous prime is 1261546009. The next prime is 1261546019. The reversal of 1261546013 is 3106451621.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 234151204 + 1027394809 = 15302^2 + 32053^2 .

It is not a de Polignac number, because 1261546013 - 2² = 1261546009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261546019) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1049813 + ... + 1051013.

It is an arithmetic number, because the mean of its divisors is an integer number (35250453).

Almost surely, 2^1261546013 is an apocalyptic number.

1261546013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1261546013 is a deficient number, since it is larger than the sum of its proper divisors (430475731).

1261546013 is a wasteful number, since it uses less digits than its factorization.

1261546013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1261546013 is about 35518.2490137112. The cubic root of 1261546013 is about 1080.5238693626.

Adding to 1261546013 its reverse (3106451621), we get a palindrome (4367997634).

The spelling of 1261546013 in words is "one billion, two hundred sixty-one million, five hundred forty-six thousand, thirteen".