11312131505 has 16 divisors (see below), whose sum is σ = 13641267024. Its totient is φ = 9005291520.

The previous prime is 11312131463. The next prime is 11312131547. The reversal of 11312131505 is 50513121311.

It is an interprime number because it is at equal distance from previous prime (11312131463) and next prime (11312131547).

It can be written as a sum of positive squares in 8 ways, for example, as 514427761 + 10797703744 = 22681^2 + 103912^2 .

It is not a de Polignac number, because 11312131505 - 2¹⁶ = 11312065969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2085557 + ... + 2090973.

It is an arithmetic number, because the mean of its divisors is an integer number (852579189).

Almost surely, 2^11312131505 is an apocalyptic number.

It is an amenable number.

11312131505 is a deficient number, since it is larger than the sum of its proper divisors (2329135519).

11312131505 is a wasteful number, since it uses less digits than its factorization.

11312131505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 11312131505 its reverse (50513121311), we get a palindrome (61825252816).

The spelling of 11312131505 in words is "eleven billion, three hundred twelve million, one hundred thirty-one thousand, five hundred five".