81876407 has 2 divisors, whose sum is σ = 81876408. Its totient is φ = 81876406.

The previous prime is 81876391. The next prime is 81876413. The reversal of 81876407 is 70467818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81876407 - 2⁴ = 81876391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81876427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40938203 + 40938204.

It is an arithmetic number, because the mean of its divisors is an integer number (40938204).

Almost surely, 2^81876407 is an apocalyptic number.

81876407 is a deficient number, since it is larger than the sum of its proper divisors (1).

81876407 is an equidigital number, since it uses as much as digits as its factorization.

81876407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 81876407 is about 9048.5582829531. The cubic root of 81876407 is about 434.2297674815.

The spelling of 81876407 in words is "eighty-one million, eight hundred seventy-six thousand, four hundred seven".