195072649 has 4 divisors (see below), whose sum is σ = 195372036. Its totient is φ = 194773264.

The previous prime is 195072617. The next prime is 195072653. The reversal of 195072649 is 946270591.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19642624 + 175430025 = 4432^2 + 13245^2 .

It is a cyclic number.

It is not a de Polignac number, because 195072649 - 2⁵ = 195072617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195072679) 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 in 3 ways as a sum of consecutive naturals, for example, 148714 + ... + 150019.

It is an arithmetic number, because the mean of its divisors is an integer number (48843009).

Almost surely, 2^195072649 is an apocalyptic number.

It is an amenable number.

195072649 is a deficient number, since it is larger than the sum of its proper divisors (299387).

195072649 is an equidigital number, since it uses as much as digits as its factorization.

195072649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299386.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 195072649 is about 13966.8410530084. The cubic root of 195072649 is about 579.9610051072.

The spelling of 195072649 in words is "one hundred ninety-five million, seventy-two thousand, six hundred forty-nine".