81698327 has 2 divisors, whose sum is σ = 81698328. Its totient is φ = 81698326.

The previous prime is 81698293. The next prime is 81698333. The reversal of 81698327 is 72389618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81698327 - 2¹⁰ = 81697303 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81698927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40849163 + 40849164.

It is an arithmetic number, because the mean of its divisors is an integer number (40849164).

Almost surely, 2^81698327 is an apocalyptic number.

81698327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81698327 is an equidigital number, since it uses as much as digits as its factorization.

81698327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 81698327 is about 9038.7126848905. The cubic root of 81698327 is about 433.9147244802.

The spelling of 81698327 in words is "eighty-one million, six hundred ninety-eight thousand, three hundred twenty-seven".