81402527 has 2 divisors, whose sum is σ = 81402528. Its totient is φ = 81402526.

The previous prime is 81402493. The next prime is 81402557. The reversal of 81402527 is 72520418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81402527 - 2⁶ = 81402463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81402527.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81402557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40701263 + 40701264.

It is an arithmetic number, because the mean of its divisors is an integer number (40701264).

Almost surely, 2^81402527 is an apocalyptic number.

81402527 is a deficient number, since it is larger than the sum of its proper divisors (1).

81402527 is an equidigital number, since it uses as much as digits as its factorization.

81402527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 81402527 is about 9022.3348973533. The cubic root of 81402527 is about 433.3904085900.

The spelling of 81402527 in words is "eighty-one million, four hundred two thousand, five hundred twenty-seven".