395015261 has 2 divisors, whose sum is σ = 395015262. Its totient is φ = 395015260.

The previous prime is 395015233. The next prime is 395015267. The reversal of 395015261 is 162510593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361722361 + 33292900 = 19019^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 395015261 - 2²² = 390820957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395015267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197507630 + 197507631.

It is an arithmetic number, because the mean of its divisors is an integer number (197507631).

Almost surely, 2^395015261 is an apocalyptic number.

It is an amenable number.

395015261 is a deficient number, since it is larger than the sum of its proper divisors (1).

395015261 is an equidigital number, since it uses as much as digits as its factorization.

395015261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 395015261 is about 19874.9908427652. The cubic root of 395015261 is about 733.7328412454.

The spelling of 395015261 in words is "three hundred ninety-five million, fifteen thousand, two hundred sixty-one".