1131213113 has 4 divisors (see below), whose sum is σ = 1131421668. Its totient is φ = 1131004560.

The previous prime is 1131213101. The next prime is 1131213137. The reversal of 1131213113 is 3113121311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128414224 + 1002798889 = 11332^2 + 31667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131213113 - 2¹² = 1131209017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1131213091 and 1131213100.

It is not an unprimeable number, because it can be changed into a prime (1131213143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95918 + ... + 107063.

It is an arithmetic number, because the mean of its divisors is an integer number (282855417).

Almost surely, 2^1131213113 is an apocalyptic number.

It is an amenable number.

1131213113 is a deficient number, since it is larger than the sum of its proper divisors (208555).

1131213113 is an equidigital number, since it uses as much as digits as its factorization.

1131213113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208554.

The product of its digits is 54, while the sum is 17.

The square root of 1131213113 is about 33633.5117553906. The cubic root of 1131213113 is about 1041.9530340248.

Adding to 1131213113 its reverse (3113121311), we get a palindrome (4244334424).

It can be divided in two parts, 113121311 and 3, that multiplied together give a palindrome (339363933).

The spelling of 1131213113 in words is "one billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred thirteen".