1324621261 has 2 divisors, whose sum is σ = 1324621262. Its totient is φ = 1324621260.

The previous prime is 1324621253. The next prime is 1324621307. The reversal of 1324621261 is 1621264231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1315440361 + 9180900 = 36269^2 + 3030^2 .

It is an emirp because it is prime and its reverse (1621264231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1324621261 - 2³ = 1324621253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1324621231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662310630 + 662310631.

It is an arithmetic number, because the mean of its divisors is an integer number (662310631).

Almost surely, 2^1324621261 is an apocalyptic number.

It is an amenable number.

1324621261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1324621261 is an equidigital number, since it uses as much as digits as its factorization.

1324621261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 1324621261 is about 36395.3466943234. The cubic root of 1324621261 is about 1098.2399569897.

Adding to 1324621261 its reverse (1621264231), we get a palindrome (2945885492).

The spelling of 1324621261 in words is "one billion, three hundred twenty-four million, six hundred twenty-one thousand, two hundred sixty-one".