1231797545 has 24 divisors (see below), whose sum is σ = 1695411648. Its totient is φ = 856892960.

The previous prime is 1231797529. The next prime is 1231797557. The reversal of 1231797545 is 5457971321.

It is not a de Polignac number, because 1231797545 - 2⁴ = 1231797529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231797496 and 1231797505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30347 + ... + 58176.

It is an arithmetic number, because the mean of its divisors is an integer number (70642152).

Almost surely, 2^1231797545 is an apocalyptic number.

It is an amenable number.

1231797545 is a deficient number, since it is larger than the sum of its proper divisors (463614103).

1231797545 is a wasteful number, since it uses less digits than its factorization.

1231797545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88573 (or 88562 counting only the distinct ones).

The product of its digits is 264600, while the sum is 44.

The square root of 1231797545 is about 35096.9734450137. The cubic root of 1231797545 is about 1071.9629570742.

The spelling of 1231797545 in words is "one billion, two hundred thirty-one million, seven hundred ninety-seven thousand, five hundred forty-five".