1231947485 has 4 divisors (see below), whose sum is σ = 1478336988. Its totient is φ = 985557984.

The previous prime is 1231947473. The next prime is 1231947487. The reversal of 1231947485 is 5847491321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 910892761 + 321054724 = 30181^2 + 17918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231947485 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231947487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123194744 + ... + 123194753.

It is an arithmetic number, because the mean of its divisors is an integer number (369584247).

Almost surely, 2^1231947485 is an apocalyptic number.

It is an amenable number.

1231947485 is a deficient number, since it is larger than the sum of its proper divisors (246389503).

1231947485 is an equidigital number, since it uses as much as digits as its factorization.

1231947485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246389502.

The product of its digits is 241920, while the sum is 44.

The square root of 1231947485 is about 35099.1094616373. The cubic root of 1231947485 is about 1072.0064500452.

The spelling of 1231947485 in words is "one billion, two hundred thirty-one million, nine hundred forty-seven thousand, four hundred eighty-five".