1245523131 has 12 divisors (see below), whose sum is σ = 1893778120. Its totient is φ = 786646080.

The previous prime is 1245523127. The next prime is 1245523141. The reversal of 1245523131 is 1313255421.

1245523131 is a `hidden beast` number, since 1 + 2 + 4 + 5 + 523 + 131 = 666.

It is not a de Polignac number, because 1245523131 - 2² = 1245523127 is a prime.

It is a super-2 number, since 2×1245523131² = 3102655739712086322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1245523095 and 1245523104.

It is not an unprimeable number, because it can be changed into a prime (1245523141) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3641710 + ... + 3642051.

Almost surely, 2^1245523131 is an apocalyptic number.

1245523131 is a deficient number, since it is larger than the sum of its proper divisors (648254989).

1245523131 is a wasteful number, since it uses less digits than its factorization.

1245523131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7283786 (or 7283783 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1245523131 is about 35291.9697806739. The cubic root of 1245523131 is about 1075.9297904167.

Adding to 1245523131 its reverse (1313255421), we get a palindrome (2558778552).

It can be divided in two parts, 124 and 5523131, that added together give a palindrome (5523255).

The spelling of 1245523131 in words is "one billion, two hundred forty-five million, five hundred twenty-three thousand, one hundred thirty-one".