1449661561 has 8 divisors (see below), whose sum is σ = 1481364864. Its totient is φ = 1417994160.

The previous prime is 1449661531. The next prime is 1449661627. The reversal of 1449661561 is 1651669441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1449661561 - 2⁹ = 1449661049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1449661531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82771 + ... + 98743.

It is an arithmetic number, because the mean of its divisors is an integer number (185170608).

Almost surely, 2^1449661561 is an apocalyptic number.

It is an amenable number.

1449661561 is a deficient number, since it is larger than the sum of its proper divisors (31703303).

1449661561 is a wasteful number, since it uses less digits than its factorization.

1449661561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17951.

The product of its digits is 155520, while the sum is 43.

The square root of 1449661561 is about 38074.4213481965. The cubic root of 1449661561 is about 1131.7631287460.

The spelling of 1449661561 in words is "one billion, four hundred forty-nine million, six hundred sixty-one thousand, five hundred sixty-one".