81148787 has 2 divisors, whose sum is σ = 81148788. Its totient is φ = 81148786.

The previous prime is 81148741. The next prime is 81148789. The reversal of 81148787 is 78784118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81148787 - 2¹⁰ = 81147763 is a prime.

Together with 81148789, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81148789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40574393 + 40574394.

It is an arithmetic number, because the mean of its divisors is an integer number (40574394).

Almost surely, 2^81148787 is an apocalyptic number.

81148787 is a deficient number, since it is larger than the sum of its proper divisors (1).

81148787 is an equidigital number, since it uses as much as digits as its factorization.

81148787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 44.

The square root of 81148787 is about 9008.2621520469. The cubic root of 81148787 is about 432.9396324875.

The spelling of 81148787 in words is "eighty-one million, one hundred forty-eight thousand, seven hundred eighty-seven".