1137911221 has 2 divisors, whose sum is σ = 1137911222. Its totient is φ = 1137911220.

The previous prime is 1137911213. The next prime is 1137911227. The reversal of 1137911221 is 1221197311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 759608721 + 378302500 = 27561^2 + 19450^2 .

It is a cyclic number.

It is not a de Polignac number, because 1137911221 - 2³ = 1137911213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1137911221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1137911227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 568955610 + 568955611.

It is an arithmetic number, because the mean of its divisors is an integer number (568955611).

Almost surely, 2^1137911221 is an apocalyptic number.

It is an amenable number.

1137911221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1137911221 is an equidigital number, since it uses as much as digits as its factorization.

1137911221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 28.

The square root of 1137911221 is about 33732.9397029076. The cubic root of 1137911221 is about 1044.0055161969.

The spelling of 1137911221 in words is "one billion, one hundred thirty-seven million, nine hundred eleven thousand, two hundred twenty-one".