1249490921 has 8 divisors (see below), whose sum is σ = 1432643520. Its totient is φ = 1067501808.

The previous prime is 1249490917. The next prime is 1249490923. The reversal of 1249490921 is 1290949421.

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 1249490921 - 2² = 1249490917 is a prime.

It is a super-2 number, since 2×1249490921² = 3122455123322856482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1249490923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288566 + ... + 292863.

It is an arithmetic number, because the mean of its divisors is an integer number (179080440).

Almost surely, 2^1249490921 is an apocalyptic number.

It is an amenable number.

1249490921 is a deficient number, since it is larger than the sum of its proper divisors (183152599).

1249490921 is an equidigital number, since it uses as much as digits as its factorization.

1249490921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581743.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1249490921 is about 35348.1388618977. The cubic root of 1249490921 is about 1077.0710881648.

The spelling of 1249490921 in words is "one billion, two hundred forty-nine million, four hundred ninety thousand, nine hundred twenty-one".