1216261301 has 4 divisors (see below), whose sum is σ = 1218445452. Its totient is φ = 1214077152.

The previous prime is 1216261297. The next prime is 1216261313. The reversal of 1216261301 is 1031626121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1031626121 = 1409 ⋅732169.

It can be written as a sum of positive squares in 2 ways, for example, as 371487076 + 844774225 = 19274^2 + 29065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216261301 - 2² = 1216261297 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 (1216261381) 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, 1091240 + ... + 1092353.

It is an arithmetic number, because the mean of its divisors is an integer number (304611363).

Almost surely, 2^1216261301 is an apocalyptic number.

It is an amenable number.

1216261301 is a deficient number, since it is larger than the sum of its proper divisors (2184151).

1216261301 is an equidigital number, since it uses as much as digits as its factorization.

1216261301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184150.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1216261301 is about 34874.9380071134. The cubic root of 1216261301 is about 1067.4371075241.

Adding to 1216261301 its reverse (1031626121), we get a palindrome (2247887422).

The spelling of 1216261301 in words is "one billion, two hundred sixteen million, two hundred sixty-one thousand, three hundred one".