691650419 has 2 divisors, whose sum is σ = 691650420. Its totient is φ = 691650418.

The previous prime is 691650409. The next prime is 691650437. The reversal of 691650419 is 914056196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691650419 - 2⁸ = 691650163 is a prime.

It is a super-2 number, since 2×691650419² = 956760604205751122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (691650409) 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, 345825209 + 345825210.

It is an arithmetic number, because the mean of its divisors is an integer number (345825210).

Almost surely, 2^691650419 is an apocalyptic number.

691650419 is a deficient number, since it is larger than the sum of its proper divisors (1).

691650419 is an equidigital number, since it uses as much as digits as its factorization.

691650419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 691650419 is about 26299.2474987403. The cubic root of 691650419 is about 884.3595732703.

The spelling of 691650419 in words is "six hundred ninety-one million, six hundred fifty thousand, four hundred nineteen".