681546091 has 2 divisors, whose sum is σ = 681546092. Its totient is φ = 681546090.

The previous prime is 681546083. The next prime is 681546101. The reversal of 681546091 is 190645186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681546091 - 2³ = 681546083 is a prime.

It is not a weakly prime, because it can be changed into another prime (681546071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340773045 + 340773046.

It is an arithmetic number, because the mean of its divisors is an integer number (340773046).

Almost surely, 2^681546091 is an apocalyptic number.

681546091 is a deficient number, since it is larger than the sum of its proper divisors (1).

681546091 is an equidigital number, since it uses as much as digits as its factorization.

681546091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 681546091 is about 26106.4377309506. The cubic root of 681546091 is about 880.0318906315.

The spelling of 681546091 in words is "six hundred eighty-one million, five hundred forty-six thousand, ninety-one".