691620467 has 2 divisors, whose sum is σ = 691620468. Its totient is φ = 691620466.

The previous prime is 691620439. The next prime is 691620481. The reversal of 691620467 is 764026196.

691620467 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691620467 - 2⁶ = 691620403 is a prime.

It is not a weakly prime, because it can be changed into another prime (691620407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345810233 + 345810234.

It is an arithmetic number, because the mean of its divisors is an integer number (345810234).

Almost surely, 2^691620467 is an apocalyptic number.

691620467 is a deficient number, since it is larger than the sum of its proper divisors (1).

691620467 is an equidigital number, since it uses as much as digits as its factorization.

691620467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 691620467 is about 26298.6780466243. The cubic root of 691620467 is about 884.3468073221.

The spelling of 691620467 in words is "six hundred ninety-one million, six hundred twenty thousand, four hundred sixty-seven".