1105123213 has 8 divisors (see below), whose sum is σ = 1143901080. Its totient is φ = 1066390080.

The previous prime is 1105123189. The next prime is 1105123219. The reversal of 1105123213 is 3123215011.

It can be written as a sum of positive squares in 4 ways, for example, as 35964009 + 1069159204 = 5997^2 + 32698^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1105123213 is a prime.

It is a super-2 number, since 2×1105123213² = 2442594631822886738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1105123219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43731 + ... + 64207.

It is an arithmetic number, because the mean of its divisors is an integer number (142987635).

Almost surely, 2^1105123213 is an apocalyptic number.

It is an amenable number.

1105123213 is a deficient number, since it is larger than the sum of its proper divisors (38777867).

1105123213 is a wasteful number, since it uses less digits than its factorization.

1105123213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22367.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1105123213 is about 33243.3935241275. The cubic root of 1105123213 is about 1033.8802371557.

Adding to 1105123213 its reverse (3123215011), we get a palindrome (4228338224).

The spelling of 1105123213 in words is "one billion, one hundred five million, one hundred twenty-three thousand, two hundred thirteen".