201990697 has 2 divisors, whose sum is σ = 201990698. Its totient is φ = 201990696.

The previous prime is 201990683. The next prime is 201990727. The reversal of 201990697 is 796099102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197233936 + 4756761 = 14044^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 201990697 - 2²³ = 193602089 is a prime.

It is not a weakly prime, because it can be changed into another prime (201990647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100995348 + 100995349.

It is an arithmetic number, because the mean of its divisors is an integer number (100995349).

Almost surely, 2^201990697 is an apocalyptic number.

It is an amenable number.

201990697 is a deficient number, since it is larger than the sum of its proper divisors (1).

201990697 is an equidigital number, since it uses as much as digits as its factorization.

201990697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 201990697 is about 14212.3431213857. The cubic root of 201990697 is about 586.7374232769.

The spelling of 201990697 in words is "two hundred one million, nine hundred ninety thousand, six hundred ninety-seven".