1231313409 has 12 divisors (see below), whose sum is σ = 1792142352. Its totient is φ = 814608600.

The previous prime is 1231313401. The next prime is 1231313423. The reversal of 1231313409 is 9043131321.

1231313409 is a `hidden beast` number, since 1 + 2 + 313 + 1 + 340 + 9 = 666.

It is not a de Polignac number, because 1231313409 - 2³ = 1231313401 is a prime.

It is a super-2 number, since 2×1231313409² = 3032265422366402562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231313401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 521007 + ... + 523364.

It is an arithmetic number, because the mean of its divisors is an integer number (149345196).

Almost surely, 2^1231313409 is an apocalyptic number.

It is an amenable number.

1231313409 is a deficient number, since it is larger than the sum of its proper divisors (560828943).

1231313409 is a wasteful number, since it uses less digits than its factorization.

1231313409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044508 (or 1044505 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 1231313409 is about 35090.0756482513. The cubic root of 1231313409 is about 1071.8225000469.

The spelling of 1231313409 in words is "one billion, two hundred thirty-one million, three hundred thirteen thousand, four hundred nine".