1309474681 has 4 divisors (see below), whose sum is σ = 1317508432. Its totient is φ = 1301440932.

The previous prime is 1309474669. The next prime is 1309474693. The reversal of 1309474681 is 1864749031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1309474669) and next prime (1309474693).

It is a cyclic number.

It is not a de Polignac number, because 1309474681 - 2⁷ = 1309474553 is a prime.

It is a super-2 number, since 2×1309474681² = 3429447880360103522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309474631) 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 3 ways as a sum of consecutive naturals, for example, 4016631 + ... + 4016956.

It is an arithmetic number, because the mean of its divisors is an integer number (329377108).

Almost surely, 2^1309474681 is an apocalyptic number.

It is an amenable number.

1309474681 is a deficient number, since it is larger than the sum of its proper divisors (8033751).

1309474681 is an equidigital number, since it uses as much as digits as its factorization.

1309474681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8033750.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1309474681 is about 36186.6644083148. The cubic root of 1309474681 is about 1094.0379033510.

The spelling of 1309474681 in words is "one billion, three hundred nine million, four hundred seventy-four thousand, six hundred eighty-one".