81150893 has 2 divisors, whose sum is σ = 81150894. Its totient is φ = 81150892.

The previous prime is 81150889. The next prime is 81150907. The reversal of 81150893 is 39805118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70930084 + 10220809 = 8422^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 81150893 - 2² = 81150889 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81150803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40575446 + 40575447.

It is an arithmetic number, because the mean of its divisors is an integer number (40575447).

Almost surely, 2^81150893 is an apocalyptic number.

It is an amenable number.

81150893 is a deficient number, since it is larger than the sum of its proper divisors (1).

81150893 is an equidigital number, since it uses as much as digits as its factorization.

81150893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 81150893 is about 9008.3790439790. The cubic root of 81150893 is about 432.9433777190.

The spelling of 81150893 in words is "eighty-one million, one hundred fifty thousand, eight hundred ninety-three".