81227407 has 2 divisors, whose sum is σ = 81227408. Its totient is φ = 81227406.

The previous prime is 81227401. The next prime is 81227423. The reversal of 81227407 is 70472218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81227407 - 2¹⁵ = 81194639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81227401) 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, 40613703 + 40613704.

It is an arithmetic number, because the mean of its divisors is an integer number (40613704).

Almost surely, 2^81227407 is an apocalyptic number.

81227407 is a deficient number, since it is larger than the sum of its proper divisors (1).

81227407 is an equidigital number, since it uses as much as digits as its factorization.

81227407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 81227407 is about 9012.6248673735. The cubic root of 81227407 is about 433.0794034307.

The spelling of 81227407 in words is "eighty-one million, two hundred twenty-seven thousand, four hundred seven".