1231012545 has 24 divisors (see below), whose sum is σ = 2291192064. Its totient is φ = 562748256.

The previous prime is 1231012529. The next prime is 1231012567. The reversal of 1231012545 is 5452101321.

It is a happy number.

It is not a de Polignac number, because 1231012545 - 2⁴ = 1231012529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 836689 + ... + 838158.

It is an arithmetic number, because the mean of its divisors is an integer number (95466336).

Almost surely, 2^1231012545 is an apocalyptic number.

1231012545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231012545 is a deficient number, since it is larger than the sum of its proper divisors (1060179519).

1231012545 is a wasteful number, since it uses less digits than its factorization.

1231012545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674869 (or 1674862 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1231012545 is about 35085.7883622415. The cubic root of 1231012545 is about 1071.7351951493.

Adding to 1231012545 its reverse (5452101321), we get a palindrome (6683113866).

The spelling of 1231012545 in words is "one billion, two hundred thirty-one million, twelve thousand, five hundred forty-five".