691242983 has 2 divisors, whose sum is σ = 691242984. Its totient is φ = 691242982.

The previous prime is 691242977. The next prime is 691243019. The reversal of 691242983 is 389242196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691242983 - 2¹⁶ = 691177447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691242973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345621491 + 345621492.

It is an arithmetic number, because the mean of its divisors is an integer number (345621492).

Almost surely, 2^691242983 is an apocalyptic number.

691242983 is a deficient number, since it is larger than the sum of its proper divisors (1).

691242983 is an equidigital number, since it uses as much as digits as its factorization.

691242983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 691242983 is about 26291.5002044387. The cubic root of 691242983 is about 884.1858869241.

The spelling of 691242983 in words is "six hundred ninety-one million, two hundred forty-two thousand, nine hundred eighty-three".