101805997 has 2 divisors, whose sum is σ = 101805998. Its totient is φ = 101805996.

The previous prime is 101805973. The next prime is 101806043. The reversal of 101805997 is 799508101.

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., 100380361 + 1425636 = 10019^2 + 1194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101805997 is a prime.

It is a super-2 number, since 2×101805997² = 20728922050328018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101805917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50902998 + 50902999.

It is an arithmetic number, because the mean of its divisors is an integer number (50902999).

Almost surely, 2^101805997 is an apocalyptic number.

It is an amenable number.

101805997 is a deficient number, since it is larger than the sum of its proper divisors (1).

101805997 is an equidigital number, since it uses as much as digits as its factorization.

101805997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 101805997 is about 10089.8957873707. The cubic root of 101805997 is about 466.9364607172.

The spelling of 101805997 in words is "one hundred one million, eight hundred five thousand, nine hundred ninety-seven".