81120407 has 2 divisors, whose sum is σ = 81120408. Its totient is φ = 81120406.

The previous prime is 81120383. The next prime is 81120433. The reversal of 81120407 is 70402118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81120407 - 2⁶ = 81120343 is a prime.

It is a Chen prime.

It is equal to p_4731143 and since 81120407 and 4731143 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81120437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40560203 + 40560204.

It is an arithmetic number, because the mean of its divisors is an integer number (40560204).

Almost surely, 2^81120407 is an apocalyptic number.

81120407 is a deficient number, since it is larger than the sum of its proper divisors (1).

81120407 is an equidigital number, since it uses as much as digits as its factorization.

81120407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 81120407 is about 9006.6867937105. The cubic root of 81120407 is about 432.8891562374.

The spelling of 81120407 in words is "eighty-one million, one hundred twenty thousand, four hundred seven".