207138881 has 2 divisors, whose sum is σ = 207138882. Its totient is φ = 207138880.

The previous prime is 207138853. The next prime is 207138889. The reversal of 207138881 is 188831702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205062400 + 2076481 = 14320^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 207138881 - 2¹⁰ = 207137857 is a prime.

It is a super-2 number, since 2×207138881² = 85813032043864322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (207138889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103569440 + 103569441.

It is an arithmetic number, because the mean of its divisors is an integer number (103569441).

Almost surely, 2^207138881 is an apocalyptic number.

It is an amenable number.

207138881 is a deficient number, since it is larger than the sum of its proper divisors (1).

207138881 is an equidigital number, since it uses as much as digits as its factorization.

207138881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 207138881 is about 14392.3202090559. The cubic root of 207138881 is about 591.6804347608.

The spelling of 207138881 in words is "two hundred seven million, one hundred thirty-eight thousand, eight hundred eighty-one".