6961489921 has 4 divisors (see below), whose sum is σ = 7186054144. Its totient is φ = 6736925700.

The previous prime is 6961489907. The next prime is 6961489937. The reversal of 6961489921 is 1299841696.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6961489921 - 2¹¹ = 6961487873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6961489981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112282065 + ... + 112282126.

It is an arithmetic number, because the mean of its divisors is an integer number (1796513536).

Almost surely, 2^6961489921 is an apocalyptic number.

It is an amenable number.

6961489921 is a deficient number, since it is larger than the sum of its proper divisors (224564223).

6961489921 is a wasteful number, since it uses less digits than its factorization.

6961489921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224564222.

The product of its digits is 1679616, while the sum is 55.

The square root of 6961489921 is about 83435.5435111440. The cubic root of 6961489921 is about 1909.4167714799.

The spelling of 6961489921 in words is "six billion, nine hundred sixty-one million, four hundred eighty-nine thousand, nine hundred twenty-one".