691047146123 has 2 divisors, whose sum is σ = 691047146124. Its totient is φ = 691047146122.

The previous prime is 691047146107. The next prime is 691047146129. The reversal of 691047146123 is 321641740196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691047146123 - 2⁴ = 691047146107 is a prime.

It is a super-2 number, since 2×691047146123² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (691047146129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345523573061 + 345523573062.

It is an arithmetic number, because the mean of its divisors is an integer number (345523573062).

Almost surely, 2^691047146123 is an apocalyptic number.

691047146123 is a deficient number, since it is larger than the sum of its proper divisors (1).

691047146123 is an equidigital number, since it uses as much as digits as its factorization.

691047146123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 691047146123 in words is "six hundred ninety-one billion, forty-seven million, one hundred forty-six thousand, one hundred twenty-three".