1231513105 has 32 divisors (see below), whose sum is σ = 1546304256. Its totient is φ = 940800000.

The previous prime is 1231513103. The next prime is 1231513111. The reversal of 1231513105 is 5013151321.

It is not a de Polignac number, because 1231513105 - 2¹ = 1231513103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231513103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3070905 + ... + 3071305.

It is an arithmetic number, because the mean of its divisors is an integer number (48322008).

Almost surely, 2^1231513105 is an apocalyptic number.

It is an amenable number.

1231513105 is a deficient number, since it is larger than the sum of its proper divisors (314791151).

1231513105 is a wasteful number, since it uses less digits than its factorization.

1231513105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1231513105 is about 35092.9210097991. The cubic root of 1231513105 is about 1071.8804401008.

Adding to 1231513105 its reverse (5013151321), we get a palindrome (6244664426).

The spelling of 1231513105 in words is "one billion, two hundred thirty-one million, five hundred thirteen thousand, one hundred five".