1236561013 has 8 divisors (see below), whose sum is σ = 1243687680. Its totient is φ = 1229454240.

The previous prime is 1236560993. The next prime is 1236561017. The reversal of 1236561013 is 3101656321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1236561013 - 2²¹ = 1234463861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1236561017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130006 + ... + 139192.

It is an arithmetic number, because the mean of its divisors is an integer number (155460960).

Almost surely, 2^1236561013 is an apocalyptic number.

It is an amenable number.

1236561013 is a deficient number, since it is larger than the sum of its proper divisors (7126667).

1236561013 is an equidigital number, since it uses as much as digits as its factorization.

1236561013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9947.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1236561013 is about 35164.7694859500. The cubic root of 1236561013 is about 1073.3429709815.

The spelling of 1236561013 in words is "one billion, two hundred thirty-six million, five hundred sixty-one thousand, thirteen".