1309221648 has 60 divisors (see below), whose sum is σ = 4187434368. Its totient is φ = 374063040.

The previous prime is 1309221647. The next prime is 1309221649. The reversal of 1309221648 is 8461229031.

1309221648 is a `hidden beast` number, since 1 + 3 + 0 + 9 + 2 + 2 + 1 + 648 = 666.

It is an interprime number because it is at equal distance from previous prime (1309221647) and next prime (1309221649).

It is a super-2 number, since 2×1309221648² = 3428122647183671808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1309221643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 648408 + ... + 650423.

Almost surely, 2^1309221648 is an apocalyptic number.

1309221648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1309221648 is an abundant number, since it is smaller than the sum of its proper divisors (2878212720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1309221648 is a wasteful number, since it uses less digits than its factorization.

1309221648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298852 (or 1298843 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1309221648 is about 36183.1680205037. The cubic root of 1309221648 is about 1093.9674309370.

The spelling of 1309221648 in words is "one billion, three hundred nine million, two hundred twenty-one thousand, six hundred forty-eight".