6920872961 has 2 divisors, whose sum is σ = 6920872962. Its totient is φ = 6920872960.

The previous prime is 6920872943. The next prime is 6920872963. The reversal of 6920872961 is 1692780296.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4888666561 + 2032206400 = 69919^2 + 45080^2 .

It is a cyclic number.

It is not a de Polignac number, because 6920872961 - 2⁶ = 6920872897 is a prime.

Together with 6920872963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6920872963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460436480 + 3460436481.

It is an arithmetic number, because the mean of its divisors is an integer number (3460436481).

Almost surely, 2^6920872961 is an apocalyptic number.

It is an amenable number.

6920872961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6920872961 is an equidigital number, since it uses as much as digits as its factorization.

6920872961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 6920872961 is about 83191.7842157505. The cubic root of 6920872961 is about 1905.6960149633.

The spelling of 6920872961 in words is "six billion, nine hundred twenty million, eight hundred seventy-two thousand, nine hundred sixty-one".