1131213101 has 2 divisors, whose sum is σ = 1131213102. Its totient is φ = 1131213100.

The previous prime is 1131213073. The next prime is 1131213137. The reversal of 1131213101 is 1013121311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1074135076 + 57078025 = 32774^2 + 7555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131213101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131213401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565606550 + 565606551.

It is an arithmetic number, because the mean of its divisors is an integer number (565606551).

Almost surely, 2^1131213101 is an apocalyptic number.

It is an amenable number.

1131213101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131213101 is an equidigital number, since it uses as much as digits as its factorization.

1131213101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1131213101 is about 33633.5115769971. The cubic root of 1131213101 is about 1041.9530303404.

Adding to 1131213101 its reverse (1013121311), we get a palindrome (2144334412).

It can be divided in two parts, 113121310 and 1, that added together give a palindrome (113121311).

The spelling of 1131213101 in words is "one billion, one hundred thirty-one million, two hundred thirteen thousand, one hundred one".