6921769961 has 2 divisors, whose sum is σ = 6921769962. Its totient is φ = 6921769960.

The previous prime is 6921769951. The next prime is 6921769969. The reversal of 6921769961 is 1699671296.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4074907225 + 2846862736 = 63835^2 + 53356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6921769961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6921769897 and 6921769906.

It is not a weakly prime, because it can be changed into another prime (6921769969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460884980 + 3460884981.

It is an arithmetic number, because the mean of its divisors is an integer number (3460884981).

Almost surely, 2^6921769961 is an apocalyptic number.

It is an amenable number.

6921769961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921769961 is an equidigital number, since it uses as much as digits as its factorization.

6921769961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 56.

The square root of 6921769961 is about 83197.1751984405. The cubic root of 6921769961 is about 1905.7783425102.

The spelling of 6921769961 in words is "six billion, nine hundred twenty-one million, seven hundred sixty-nine thousand, nine hundred sixty-one".