6961222781 has 16 divisors (see below), whose sum is σ = 7565529600. Its totient is φ = 6379971840.

The previous prime is 6961222777. The next prime is 6961222787. The reversal of 6961222781 is 1872221696.

It is a happy number.

It is not a de Polignac number, because 6961222781 - 2² = 6961222777 is a prime.

It is a super-2 number, since 2×6961222781² = 96917245213426747922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6961222787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137111 + ... + 180891.

It is an arithmetic number, because the mean of its divisors is an integer number (472845600).

Almost surely, 2^6961222781 is an apocalyptic number.

It is an amenable number.

6961222781 is a deficient number, since it is larger than the sum of its proper divisors (604306819).

6961222781 is a wasteful number, since it uses less digits than its factorization.

6961222781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44044.

The product of its digits is 145152, while the sum is 44.

The square root of 6961222781 is about 83433.9426192961. The cubic root of 6961222781 is about 1909.3923472007.

The spelling of 6961222781 in words is "six billion, nine hundred sixty-one million, two hundred twenty-two thousand, seven hundred eighty-one".