2311221137 has 2 divisors, whose sum is σ = 2311221138. Its totient is φ = 2311221136.

The previous prime is 2311221113. The next prime is 2311221163. The reversal of 2311221137 is 7311221132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1333783441 + 977437696 = 36521^2 + 31264^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311221137 - 2¹⁶ = 2311155601 is a prime.

It is not a weakly prime, because it can be changed into another prime (2311221167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155610568 + 1155610569.

It is an arithmetic number, because the mean of its divisors is an integer number (1155610569).

Almost surely, 2^2311221137 is an apocalyptic number.

It is an amenable number.

2311221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311221137 is an equidigital number, since it uses as much as digits as its factorization.

2311221137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 23.

The square root of 2311221137 is about 48075.1613309826. The cubic root of 2311221137 is about 1322.1493024654.

Adding to 2311221137 its reverse (7311221132), we get a palindrome (9622442269).

The spelling of 2311221137 in words is "two billion, three hundred eleven million, two hundred twenty-one thousand, one hundred thirty-seven".