1231354250505 has 24 divisors (see below), whose sum is σ = 2203197285120. Its totient is φ = 635537676960.

The previous prime is 1231354250491. The next prime is 1231354250509. The reversal of 1231354250505 is 5050524531321.

1231354250505 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 354 + 250 + 50 + 5 = 666.

It is not a de Polignac number, because 1231354250505 - 2⁸ = 1231354250249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231354250505.

It is not an unprimeable number, because it can be changed into a prime (1231354250509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 441344215 + ... + 441347004.

It is an arithmetic number, because the mean of its divisors is an integer number (91799886880).

Almost surely, 2^{1231354250505} is an apocalyptic number.

1231354250505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231354250505 is a deficient number, since it is larger than the sum of its proper divisors (971843034615).

1231354250505 is a wasteful number, since it uses less digits than its factorization.

1231354250505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882691261 (or 882691258 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 1231354250505 its reverse (5050524531321), we get a palindrome (6281878781826).

The spelling of 1231354250505 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-four million, two hundred fifty thousand, five hundred five".