83781007 has 2 divisors, whose sum is σ = 83781008. Its totient is φ = 83781006.

The previous prime is 83780989. The next prime is 83781041. The reversal of 83781007 is 70018738.

It is a happy number.

It is an a-pointer prime, because the next prime (83781041) can be obtained adding 83781007 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83781007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83781077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41890503 + 41890504.

It is an arithmetic number, because the mean of its divisors is an integer number (41890504).

Almost surely, 2^83781007 is an apocalyptic number.

83781007 is a deficient number, since it is larger than the sum of its proper divisors (1).

83781007 is an equidigital number, since it uses as much as digits as its factorization.

83781007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 83781007 is about 9153.1965454698. The cubic root of 83781007 is about 437.5709938668.

The spelling of 83781007 in words is "eighty-three million, seven hundred eighty-one thousand, seven".