1231540525412 has 6 divisors (see below), whose sum is σ = 2155195919478. Its totient is φ = 615770262704.

The previous prime is 1231540525409. The next prime is 1231540525417. The reversal of 1231540525412 is 2145250451321.

It can be written as a sum of positive squares in only one way, i.e., 1106354763556 + 125185761856 = 1051834^2 + 353816^2 .

It is not an unprimeable number, because it can be changed into a prime (1231540525417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153942565673 + ... + 153942565680.

It is an arithmetic number, because the mean of its divisors is an integer number (359199319913).

Almost surely, 2^{1231540525412} is an apocalyptic number.

It is an amenable number.

1231540525412 is a deficient number, since it is larger than the sum of its proper divisors (923655394066).

1231540525412 is a wasteful number, since it uses less digits than its factorization.

1231540525412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307885131357 (or 307885131355 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 1231540525412 its reverse (2145250451321), we get a palindrome (3376790976733).

The spelling of 1231540525412 in words is "one trillion, two hundred thirty-one billion, five hundred forty million, five hundred twenty-five thousand, four hundred twelve".