207097981 has 2 divisors, whose sum is σ = 207097982. Its totient is φ = 207097980.

The previous prime is 207097973. The next prime is 207098039. The reversal of 207097981 is 189790702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105390756 + 101707225 = 10266^2 + 10085^2 .

It is a cyclic number.

It is not a de Polignac number, because 207097981 - 2³ = 207097973 is a prime.

It is a super-2 number, since 2×207097981² = 85779147468552722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207092981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103548990 + 103548991.

It is an arithmetic number, because the mean of its divisors is an integer number (103548991).

Almost surely, 2^207097981 is an apocalyptic number.

It is an amenable number.

207097981 is a deficient number, since it is larger than the sum of its proper divisors (1).

207097981 is an equidigital number, since it uses as much as digits as its factorization.

207097981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 207097981 is about 14390.8992422294. The cubic root of 207097981 is about 591.6414893560.

The spelling of 207097981 in words is "two hundred seven million, ninety-seven thousand, nine hundred eighty-one".