1236261413 has 4 divisors (see below), whose sum is σ = 1245155520. Its totient is φ = 1227367308.

The previous prime is 1236261409. The next prime is 1236261451. The reversal of 1236261413 is 3141626321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3141626321 = 73 ⋅43035977.

It is a cyclic number.

It is not a de Polignac number, because 1236261413 - 2² = 1236261409 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 (1236261463) 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 3 ways as a sum of consecutive naturals, for example, 4446845 + ... + 4447122.

It is an arithmetic number, because the mean of its divisors is an integer number (311288880).

Almost surely, 2^1236261413 is an apocalyptic number.

It is an amenable number.

1236261413 is a deficient number, since it is larger than the sum of its proper divisors (8894107).

1236261413 is an equidigital number, since it uses as much as digits as its factorization.

1236261413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8894106.

The product of its digits is 5184, while the sum is 29.

The square root of 1236261413 is about 35160.5092824322. The cubic root of 1236261413 is about 1073.2562790661.

Adding to 1236261413 its reverse (3141626321), we get a palindrome (4377887734).

The spelling of 1236261413 in words is "one billion, two hundred thirty-six million, two hundred sixty-one thousand, four hundred thirteen".