1449397909521 has 6 divisors (see below), whose sum is σ = 2093574758210. Its totient is φ = 966265273008.

The previous prime is 1449397909447. The next prime is 1449397909541. The reversal of 1449397909521 is 1259097939441.

1449397909521 is a `hidden beast` number, since 1 + 4 + 4 + 9 + 39 + 79 + 0 + 9 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1263196166400 + 186201743121 = 1123920^2 + 431511^2 .

It is not a de Polignac number, because 1449397909521 - 2¹¹ = 1449397907473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1449397909541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80522106076 + ... + 80522106093.

Almost surely, 2^{1449397909521} is an apocalyptic number.

It is an amenable number.

1449397909521 is a deficient number, since it is larger than the sum of its proper divisors (644176848689).

1449397909521 is a wasteful number, since it uses less digits than its factorization.

1449397909521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161044212175 (or 161044212172 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 1449397909521 in words is "one trillion, four hundred forty-nine billion, three hundred ninety-seven million, nine hundred nine thousand, five hundred twenty-one".