1216012641 has 16 divisors (see below), whose sum is σ = 1636588800. Its totient is φ = 803091968.

The previous prime is 1216012639. The next prime is 1216012643. The reversal of 1216012641 is 1462106121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1216012639) and next prime (1216012643).

It is a cyclic number.

It is not a de Polignac number, because 1216012641 - 2¹ = 1216012639 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216012643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136945 + ... + 145553.

It is an arithmetic number, because the mean of its divisors is an integer number (102286800).

Almost surely, 2^1216012641 is an apocalyptic number.

It is an amenable number.

1216012641 is a deficient number, since it is larger than the sum of its proper divisors (420576159).

1216012641 is a wasteful number, since it uses less digits than its factorization.

1216012641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9048.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1216012641 is about 34871.3728006226. The cubic root of 1216012641 is about 1067.3643580796.

Adding to 1216012641 its reverse (1462106121), we get a palindrome (2678118762).

The spelling of 1216012641 in words is "one billion, two hundred sixteen million, twelve thousand, six hundred forty-one".