1213324261 has 2 divisors, whose sum is σ = 1213324262. Its totient is φ = 1213324260.

The previous prime is 1213324213. The next prime is 1213324271. The reversal of 1213324261 is 1624233121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607869025 + 605455236 = 24655^2 + 24606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213324261 is a prime.

It is a super-2 number, since 2×1213324261² = 2944311524662392242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213324271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606662130 + 606662131.

It is an arithmetic number, because the mean of its divisors is an integer number (606662131).

Almost surely, 2^1213324261 is an apocalyptic number.

It is an amenable number.

1213324261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213324261 is an equidigital number, since it uses as much as digits as its factorization.

1213324261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 1213324261 is about 34832.8043803539. The cubic root of 1213324261 is about 1066.5771956964.

Adding to 1213324261 its reverse (1624233121), we get a palindrome (2837557382).

The spelling of 1213324261 in words is "one billion, two hundred thirteen million, three hundred twenty-four thousand, two hundred sixty-one".