981692993 has 2 divisors, whose sum is σ = 981692994. Its totient is φ = 981692992.

The previous prime is 981692953. The next prime is 981693019. The reversal of 981692993 is 399296189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 832437904 + 149255089 = 28852^2 + 12217^2 .

It is a cyclic number.

It is not a de Polignac number, because 981692993 - 2¹⁴ = 981676609 is a prime.

It is a super-2 number, since 2×981692993² = 1927442265010596098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (981692953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490846496 + 490846497.

It is an arithmetic number, because the mean of its divisors is an integer number (490846497).

Almost surely, 2^981692993 is an apocalyptic number.

It is an amenable number.

981692993 is a deficient number, since it is larger than the sum of its proper divisors (1).

981692993 is an equidigital number, since it uses as much as digits as its factorization.

981692993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 56.

The square root of 981692993 is about 31331.9803555409. The cubic root of 981692993 is about 993.8600424111.

The spelling of 981692993 in words is "nine hundred eighty-one million, six hundred ninety-two thousand, nine hundred ninety-three".