1968833261 has 2 divisors, whose sum is σ = 1968833262. Its totient is φ = 1968833260.

The previous prime is 1968833249. The next prime is 1968833263. The reversal of 1968833261 is 1623388691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1584438025 + 384395236 = 39805^2 + 19606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968833261 - 2⁶ = 1968833197 is a prime.

Together with 1968833263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968833263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984416630 + 984416631.

It is an arithmetic number, because the mean of its divisors is an integer number (984416631).

Almost surely, 2^1968833261 is an apocalyptic number.

It is an amenable number.

1968833261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968833261 is an equidigital number, since it uses as much as digits as its factorization.

1968833261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 1968833261 is about 44371.5366085061. The cubic root of 1968833261 is about 1253.3421517333.

The spelling of 1968833261 in words is "one billion, nine hundred sixty-eight million, eight hundred thirty-three thousand, two hundred sixty-one".