195400819 has 2 divisors, whose sum is σ = 195400820. Its totient is φ = 195400818.

The previous prime is 195400817. The next prime is 195400823. The reversal of 195400819 is 918004591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195400819 - 2¹ = 195400817 is a prime.

It is a super-2 number, since 2×195400819² = 76362960131741522, which contains 22 as substring.

Together with 195400817, it forms a pair of twin primes.

It is equal to p_10838458 and since 195400819 and 10838458 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (195400813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97700409 + 97700410.

It is an arithmetic number, because the mean of its divisors is an integer number (97700410).

Almost surely, 2^195400819 is an apocalyptic number.

195400819 is a deficient number, since it is larger than the sum of its proper divisors (1).

195400819 is an equidigital number, since it uses as much as digits as its factorization.

195400819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 195400819 is about 13978.5842988480. The cubic root of 195400819 is about 580.2860449928.

The spelling of 195400819 in words is "one hundred ninety-five million, four hundred thousand, eight hundred nineteen".