1231503985 has 8 divisors (see below), whose sum is σ = 1525476096. Its totient is φ = 953422320.

The previous prime is 1231503913. The next prime is 1231503997. The reversal of 1231503985 is 5893051321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231503985 - 2¹¹ = 1231501937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3972439 + ... + 3972748.

It is an arithmetic number, because the mean of its divisors is an integer number (190684512).

Almost surely, 2^1231503985 is an apocalyptic number.

It is an amenable number.

1231503985 is a deficient number, since it is larger than the sum of its proper divisors (293972111).

1231503985 is an equidigital number, since it uses as much as digits as its factorization.

1231503985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945223.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1231503985 is about 35092.7910688221. The cubic root of 1231503985 is about 1071.8777941488.

The spelling of 1231503985 in words is "one billion, two hundred thirty-one million, five hundred three thousand, nine hundred eighty-five".