1231541385 has 8 divisors (see below), whose sum is σ = 1970466240. Its totient is φ = 656822064.

The previous prime is 1231541369. The next prime is 1231541393. The reversal of 1231541385 is 5831451321.

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

It is not a de Polignac number, because 1231541385 - 2⁴ = 1231541369 is a prime.

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, 41051365 + ... + 41051394.

It is an arithmetic number, because the mean of its divisors is an integer number (246308280).

Almost surely, 2^1231541385 is an apocalyptic number.

1231541385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231541385 is a deficient number, since it is larger than the sum of its proper divisors (738924855).

1231541385 is an equidigital number, since it uses as much as digits as its factorization.

1231541385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82102767.

The product of its digits is 14400, while the sum is 33.

The square root of 1231541385 is about 35093.3239377520. The cubic root of 1231541385 is about 1071.8886447900. Note that the first 3 decimals are identical.

The spelling of 1231541385 in words is "one billion, two hundred thirty-one million, five hundred forty-one thousand, three hundred eighty-five".