1213811701 has 2 divisors, whose sum is σ = 1213811702. Its totient is φ = 1213811700.

The previous prime is 1213811699. The next prime is 1213811737. The reversal of 1213811701 is 1071183121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 952956900 + 260854801 = 30870^2 + 16151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213811701 - 2¹ = 1213811699 is a prime.

Together with 1213811699, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213818701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606905850 + 606905851.

It is an arithmetic number, because the mean of its divisors is an integer number (606905851).

Almost surely, 2^1213811701 is an apocalyptic number.

It is an amenable number.

1213811701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213811701 is an equidigital number, since it uses as much as digits as its factorization.

1213811701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 25.

The square root of 1213811701 is about 34839.8005304278. The cubic root of 1213811701 is about 1066.7200052212.

Adding to 1213811701 its reverse (1071183121), we get a palindrome (2284994822).

The spelling of 1213811701 in words is "one billion, two hundred thirteen million, eight hundred eleven thousand, seven hundred one".