100449061969 has 3 divisors (see below), whose sum is σ = 100449378907. Its totient is φ = 100448745032.

The previous prime is 100449061957. The next prime is 100449061997. The reversal of 100449061969 is 969160944001.

The square root of 100449061969 is 316937.

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., 1168614225 + 99280447744 = 34185^2 + 315088^2 .

It is not a de Polignac number, because 100449061969 - 2⁷ = 100449061841 is a prime.

It is a super-2 number, since 2×100449061969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100449061919) 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, 158469 + ... + 475405.

Almost surely, 2^100449061969 is an apocalyptic number.

100449061969 is the 316937-th square number.

100449061969 is the 158469-th centered octagonal number.

It is an amenable number.

100449061969 is a deficient number, since it is larger than the sum of its proper divisors (316938).

100449061969 is an frugal number, since it uses more digits than its factorization.

100449061969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633874 (or 316937 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

Multiplying 100449061969 by its sum of digits (49), we get a square (4922004036481 = 2218559²).

The spelling of 100449061969 in words is "one hundred billion, four hundred forty-nine million, sixty-one thousand, nine hundred sixty-nine".