1231009857 has 96 divisors (see below), whose sum is σ = 2277310464. Its totient is φ = 622339200.

The previous prime is 1231009811. The next prime is 1231009859. The reversal of 1231009857 is 7589001321.

It is not a de Polignac number, because 1231009857 - 2¹⁶ = 1230944321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231009859) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6248683 + ... + 6248879.

It is an arithmetic number, because the mean of its divisors is an integer number (23721984).

Almost surely, 2^1231009857 is an apocalyptic number.

It is an amenable number.

1231009857 is a deficient number, since it is larger than the sum of its proper divisors (1046300607).

1231009857 is a wasteful number, since it uses less digits than its factorization.

1231009857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1231009857 is about 35085.7500561125. The cubic root of 1231009857 is about 1071.7344150798.

The spelling of 1231009857 in words is "one billion, two hundred thirty-one million, nine thousand, eight hundred fifty-seven".