2081157997 has 2 divisors, whose sum is σ = 2081157998. Its totient is φ = 2081157996.

The previous prime is 2081157983. The next prime is 2081158031. The reversal of 2081157997 is 7997511802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2070796036 + 10361961 = 45506^2 + 3219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2081157997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2081157997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081157977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040578998 + 1040578999.

It is an arithmetic number, because the mean of its divisors is an integer number (1040578999).

Almost surely, 2^2081157997 is an apocalyptic number.

It is an amenable number.

2081157997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081157997 is an equidigital number, since it uses as much as digits as its factorization.

2081157997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 2081157997 is about 45619.7106194241. The cubic root of 2081157997 is about 1276.7377043128.

The spelling of 2081157997 in words is "two billion, eighty-one million, one hundred fifty-seven thousand, nine hundred ninety-seven".