81900313699 has 2 divisors, whose sum is σ = 81900313700. Its totient is φ = 81900313698.

The previous prime is 81900313657. The next prime is 81900313727. The reversal of 81900313699 is 99631300918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81900313699 - 2¹¹ = 81900311651 is a prime.

It is a super-2 number, since 2×81900313699² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81900313609) 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, 40950156849 + 40950156850.

It is an arithmetic number, because the mean of its divisors is an integer number (40950156850).

Almost surely, 2^81900313699 is an apocalyptic number.

81900313699 is a deficient number, since it is larger than the sum of its proper divisors (1).

81900313699 is an equidigital number, since it uses as much as digits as its factorization.

81900313699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 49.

The spelling of 81900313699 in words is "eighty-one billion, nine hundred million, three hundred thirteen thousand, six hundred ninety-nine".