81953351 has 2 divisors, whose sum is σ = 81953352. Its totient is φ = 81953350.

The previous prime is 81953341. The next prime is 81953411. The reversal of 81953351 is 15335918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81953351 - 2¹⁰ = 81952327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81953321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40976675 + 40976676.

It is an arithmetic number, because the mean of its divisors is an integer number (40976676).

Almost surely, 2^81953351 is an apocalyptic number.

81953351 is a deficient number, since it is larger than the sum of its proper divisors (1).

81953351 is an equidigital number, since it uses as much as digits as its factorization.

81953351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 81953351 is about 9052.8090115720. The cubic root of 81953351 is about 434.3657485116.

The spelling of 81953351 in words is "eighty-one million, nine hundred fifty-three thousand, three hundred fifty-one".