1249486561 has 8 divisors (see below), whose sum is σ = 1281899520. Its totient is φ = 1217226192.

The previous prime is 1249486549. The next prime is 1249486627. The reversal of 1249486561 is 1656849421.

It is a happy number.

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 1249486561 - 2⁵ = 1249486529 is a prime.

It is a super-2 number, since 2×1249486561² = 3122433332239213442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249486061) 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, 21466 + ... + 54403.

It is an arithmetic number, because the mean of its divisors is an integer number (160237440).

Almost surely, 2^1249486561 is an apocalyptic number.

It is an amenable number.

1249486561 is a deficient number, since it is larger than the sum of its proper divisors (32412959).

1249486561 is an equidigital number, since it uses as much as digits as its factorization.

1249486561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76295.

The product of its digits is 414720, while the sum is 46.

The square root of 1249486561 is about 35348.0771895728. The cubic root of 1249486561 is about 1077.0698353785.

The spelling of 1249486561 in words is "one billion, two hundred forty-nine million, four hundred eighty-six thousand, five hundred sixty-one".