1985152997 has 2 divisors, whose sum is σ = 1985152998. Its totient is φ = 1985152996.

The previous prime is 1985152987. The next prime is 1985153033. The reversal of 1985152997 is 7992515891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1494131716 + 491021281 = 38654^2 + 22159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985152997 - 2⁶ = 1985152933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985152907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992576498 + 992576499.

It is an arithmetic number, because the mean of its divisors is an integer number (992576499).

Almost surely, 2^1985152997 is an apocalyptic number.

It is an amenable number.

1985152997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985152997 is an equidigital number, since it uses as much as digits as its factorization.

1985152997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 56.

The square root of 1985152997 is about 44555.0557961720. The cubic root of 1985152997 is about 1256.7956279629.

The spelling of 1985152997 in words is "one billion, nine hundred eighty-five million, one hundred fifty-two thousand, nine hundred ninety-seven".