690960191 has 2 divisors, whose sum is σ = 690960192. Its totient is φ = 690960190.

The previous prime is 690960139. The next prime is 690960217. The reversal of 690960191 is 191069096.

It is a strong prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 161096069 and 960690161.

It is a cyclic number.

It is not a de Polignac number, because 690960191 - 2¹⁰ = 690959167 is a prime.

It is equal to p_35809088 and since 690960191 and 35809088 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690960131) 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, 345480095 + 345480096.

It is an arithmetic number, because the mean of its divisors is an integer number (345480096).

Almost surely, 2^690960191 is an apocalyptic number.

690960191 is a deficient number, since it is larger than the sum of its proper divisors (1).

690960191 is an equidigital number, since it uses as much as digits as its factorization.

690960191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 690960191 is about 26286.1216424181. The cubic root of 690960191 is about 884.0652950787.

The spelling of 690960191 in words is "six hundred ninety million, nine hundred sixty thousand, one hundred ninety-one".