6961855591 has 2 divisors, whose sum is σ = 6961855592. Its totient is φ = 6961855590.

The previous prime is 6961855561. The next prime is 6961855613. The reversal of 6961855591 is 1955581696.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6961855591 - 2⁷ = 6961855463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6961855561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3480927795 + 3480927796.

It is an arithmetic number, because the mean of its divisors is an integer number (3480927796).

Almost surely, 2^6961855591 is an apocalyptic number.

6961855591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6961855591 is an equidigital number, since it uses as much as digits as its factorization.

6961855591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916000, while the sum is 55.

The square root of 6961855591 is about 83437.7348146509. The cubic root of 6961855591 is about 1909.4502032219.

The spelling of 6961855591 in words is "six billion, nine hundred sixty-one million, eight hundred fifty-five thousand, five hundred ninety-one".