195131249 has 2 divisors, whose sum is σ = 195131250. Its totient is φ = 195131248.

The previous prime is 195131239. The next prime is 195131351. The reversal of 195131249 is 942131591.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189337600 + 5793649 = 13760^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 195131249 - 2²⁰ = 194082673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195131239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97565624 + 97565625.

It is an arithmetic number, because the mean of its divisors is an integer number (97565625).

Almost surely, 2^195131249 is an apocalyptic number.

It is an amenable number.

195131249 is a deficient number, since it is larger than the sum of its proper divisors (1).

195131249 is an equidigital number, since it uses as much as digits as its factorization.

195131249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 195131249 is about 13968.9387213202. The cubic root of 195131249 is about 580.0190728964.

The spelling of 195131249 in words is "one hundred ninety-five million, one hundred thirty-one thousand, two hundred forty-nine".