6961291921 has 32 divisors (see below), whose sum is σ = 7446297600. Its totient is φ = 6498139200.

The previous prime is 6961291919. The next prime is 6961291949. The reversal of 6961291921 is 1291921696.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6961291921 - 2¹ = 6961291919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6961291321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38889810 + ... + 38889988.

It is an arithmetic number, because the mean of its divisors is an integer number (232696800).

Almost surely, 2^6961291921 is an apocalyptic number.

It is an amenable number.

6961291921 is a deficient number, since it is larger than the sum of its proper divisors (485005679).

6961291921 is a wasteful number, since it uses less digits than its factorization.

6961291921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its digits is 104976, while the sum is 46.

The square root of 6961291921 is about 83434.3569580302. The cubic root of 6961291921 is about 1909.3986686451.

The spelling of 6961291921 in words is "six billion, nine hundred sixty-one million, two hundred ninety-one thousand, nine hundred twenty-one".