137994217 has 2 divisors, whose sum is σ = 137994218. Its totient is φ = 137994216.

The previous prime is 137994203. The next prime is 137994229. The reversal of 137994217 is 712499731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 190096 = 11739^2 + 436^2 .

It is an emirp because it is prime and its reverse (712499731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137994217 - 2²⁷ = 3776489 is a prime.

It is a super-3 number, since 3×137994217³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (137994247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68997108 + 68997109.

It is an arithmetic number, because the mean of its divisors is an integer number (68997109).

Almost surely, 2^137994217 is an apocalyptic number.

It is an amenable number.

137994217 is a deficient number, since it is larger than the sum of its proper divisors (1).

137994217 is an equidigital number, since it uses as much as digits as its factorization.

137994217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 137994217 is about 11747.0939810661. The cubic root of 137994217 is about 516.7577066535.

The spelling of 137994217 in words is "one hundred thirty-seven million, nine hundred ninety-four thousand, two hundred seventeen".