78195137 has 2 divisors, whose sum is σ = 78195138. Its totient is φ = 78195136.

The previous prime is 78195083. The next prime is 78195149. The reversal of 78195137 is 73159187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45373696 + 32821441 = 6736^2 + 5729^2 .

It is a cyclic number.

It is not a de Polignac number, because 78195137 - 2¹⁰ = 78194113 is a prime.

It is a super-2 number, since 2×78195137² = 12228958900897538, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78195094 and 78195103.

It is not a weakly prime, because it can be changed into another prime (78195157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39097568 + 39097569.

It is an arithmetic number, because the mean of its divisors is an integer number (39097569).

Almost surely, 2^78195137 is an apocalyptic number.

It is an amenable number.

78195137 is a deficient number, since it is larger than the sum of its proper divisors (1).

78195137 is an equidigital number, since it uses as much as digits as its factorization.

78195137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 41.

The square root of 78195137 is about 8842.8014226262. The cubic root of 78195137 is about 427.6218764941.

The spelling of 78195137 in words is "seventy-eight million, one hundred ninety-five thousand, one hundred thirty-seven".