1231350505 has 16 divisors (see below), whose sum is σ = 1842228864. Its totient is φ = 767594880.

The previous prime is 1231350503. The next prime is 1231350541. The reversal of 1231350505 is 5050531321.

It is not a de Polignac number, because 1231350505 - 2¹ = 1231350503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231350505.

It is not an unprimeable number, because it can be changed into a prime (1231350503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1598772 + ... + 1599541.

It is an arithmetic number, because the mean of its divisors is an integer number (115139304).

Almost surely, 2^1231350505 is an apocalyptic number.

It is an amenable number.

1231350505 is a deficient number, since it is larger than the sum of its proper divisors (610878359).

1231350505 is a wasteful number, since it uses less digits than its factorization.

1231350505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198336.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 1231350505 is about 35090.6042267727. The cubic root of 1231350505 is about 1071.8332636017.

Adding to 1231350505 its reverse (5050531321), we get a palindrome (6281881826).

The spelling of 1231350505 in words is "one billion, two hundred thirty-one million, three hundred fifty thousand, five hundred five".