81240763 has 2 divisors, whose sum is σ = 81240764. Its totient is φ = 81240762.

The previous prime is 81240743. The next prime is 81240779. The reversal of 81240763 is 36704218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81240763 - 2²¹ = 79143611 is a prime.

It is not a weakly prime, because it can be changed into another prime (81240703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40620381 + 40620382.

It is an arithmetic number, because the mean of its divisors is an integer number (40620382).

Almost surely, 2^81240763 is an apocalyptic number.

81240763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81240763 is an equidigital number, since it uses as much as digits as its factorization.

81240763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 81240763 is about 9013.3657975254. The cubic root of 81240763 is about 433.1031388164.

The spelling of 81240763 in words is "eighty-one million, two hundred forty thousand, seven hundred sixty-three".