195311069 has 2 divisors, whose sum is σ = 195311070. Its totient is φ = 195311068.

The previous prime is 195311057. The next prime is 195311099. The reversal of 195311069 is 960113591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149572900 + 45738169 = 12230^2 + 6763^2 .

It is an emirp because it is prime and its reverse (960113591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195311069 - 2²⁰ = 194262493 is a prime.

It is a super-2 number, since 2×195311069² = 76292827347845522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195311029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97655534 + 97655535.

It is an arithmetic number, because the mean of its divisors is an integer number (97655535).

Almost surely, 2^195311069 is an apocalyptic number.

It is an amenable number.

195311069 is a deficient number, since it is larger than the sum of its proper divisors (1).

195311069 is an equidigital number, since it uses as much as digits as its factorization.

195311069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 195311069 is about 13975.3736622675. The cubic root of 195311069 is about 580.1971872139.

The spelling of 195311069 in words is "one hundred ninety-five million, three hundred eleven thousand, sixty-nine".