81150793 has 2 divisors, whose sum is σ = 81150794. Its totient is φ = 81150792.
The previous prime is 81150781. The next prime is 81150803. The reversal of 81150793 is 39705118.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 53187849 + 27962944 = 7293^2 + 5288^2 .
It is a cyclic number.
It is not a de Polignac number, because 81150793 - 217 = 81019721 is a prime.
It is not a weakly prime, because it can be changed into another prime (81150703) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40575396 + 40575397.
It is an arithmetic number, because the mean of its divisors is an integer number (40575397).
Almost surely, 281150793 is an apocalyptic number.
It is an amenable number.
81150793 is a deficient number, since it is larger than the sum of its proper divisors (1).
81150793 is an equidigital number, since it uses as much as digits as its factorization.
81150793 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 7560, while the sum is 34.
The square root of 81150793 is about 9008.3734935892. The cubic root of 81150793 is about 432.9431998842.
The spelling of 81150793 in words is "eighty-one million, one hundred fifty thousand, seven hundred ninety-three".
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