195720101 has 16 divisors (see below), whose sum is σ = 209669040. Its totient is φ = 182353920.

The previous prime is 195720097. The next prime is 195720103. The reversal of 195720101 is 101027591.

It is a Cunningham number, because it is equal to 13990²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 195720100 = 1^2 + 13990^2 .

It is a cyclic number.

It is not a de Polignac number, because 195720101 - 2² = 195720097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195720103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114485 + ... + 116181.

It is an arithmetic number, because the mean of its divisors is an integer number (13104315).

Almost surely, 2^195720101 is an apocalyptic number.

It is an amenable number.

195720101 is a deficient number, since it is larger than the sum of its proper divisors (13948939).

195720101 is a wasteful number, since it uses less digits than its factorization.

195720101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 195720101 is about 13990.0000357398. Note that the first 4 decimals coincide. The cubic root of 195720101 is about 580.6019325607.

Adding to 195720101 its reverse (101027591), we get a palindrome (296747692).

The spelling of 195720101 in words is "one hundred ninety-five million, seven hundred twenty thousand, one hundred one".