81153847 has 2 divisors, whose sum is σ = 81153848. Its totient is φ = 81153846.

The previous prime is 81153841. The next prime is 81153871. The reversal of 81153847 is 74835118.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81153847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81153841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40576923 + 40576924.

It is an arithmetic number, because the mean of its divisors is an integer number (40576924).

Almost surely, 2^81153847 is an apocalyptic number.

81153847 is a deficient number, since it is larger than the sum of its proper divisors (1).

81153847 is an equidigital number, since it uses as much as digits as its factorization.

81153847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 37.

The square root of 81153847 is about 9008.5430009519. The cubic root of 81153847 is about 432.9486308928.

The spelling of 81153847 in words is "eighty-one million, one hundred fifty-three thousand, eight hundred forty-seven".