137663221 has 2 divisors, whose sum is σ = 137663222. Its totient is φ = 137663220.

The previous prime is 137663213. The next prime is 137663299. The reversal of 137663221 is 122366731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89984196 + 47679025 = 9486^2 + 6905^2 .

It is a cyclic number.

It is not a de Polignac number, because 137663221 - 2³ = 137663213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137663021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68831610 + 68831611.

It is an arithmetic number, because the mean of its divisors is an integer number (68831611).

Almost surely, 2^137663221 is an apocalyptic number.

It is an amenable number.

137663221 is a deficient number, since it is larger than the sum of its proper divisors (1).

137663221 is an equidigital number, since it uses as much as digits as its factorization.

137663221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 137663221 is about 11732.9971021900. The cubic root of 137663221 is about 516.3442070220.

The spelling of 137663221 in words is "one hundred thirty-seven million, six hundred sixty-three thousand, two hundred twenty-one".