195502812649 has 3 divisors (see below), whose sum is σ = 195503254807. Its totient is φ = 195502370492.

The previous prime is 195502812629. The next prime is 195502812653. The reversal of 195502812649 is 946218205591.

It is a happy number.

The square root of 195502812649 is 442157.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 39424088025 + 156078724624 = 198555^2 + 395068^2 .

It is not a de Polignac number, because 195502812649 - 2¹⁵ = 195502779881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 195502812596 and 195502812605.

It is not an unprimeable number, because it can be changed into a prime (195502812619) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 221079 + ... + 663235.

Almost surely, 2^195502812649 is an apocalyptic number.

195502812649 is the 442157-th square number.

195502812649 is the 221079-th centered octagonal number.

It is an amenable number.

195502812649 is a deficient number, since it is larger than the sum of its proper divisors (442158).

195502812649 is an frugal number, since it uses more digits than its factorization.

195502812649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884314 (or 442157 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 195502812649 in words is "one hundred ninety-five billion, five hundred two million, eight hundred twelve thousand, six hundred forty-nine".