101780945 has 8 divisors (see below), whose sum is σ = 139585344. Its totient is φ = 69792624.

The previous prime is 101780941. The next prime is 101780951. The reversal of 101780945 is 549087101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 101780945 - 2² = 101780941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 2908027 = 101780945 / (1 + 0 + 1 + 7 + 8 + 0 + 9 + 4 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101780941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1453979 + ... + 1454048.

It is an arithmetic number, because the mean of its divisors is an integer number (17448168).

Almost surely, 2^101780945 is an apocalyptic number.

It is an amenable number.

101780945 is a deficient number, since it is larger than the sum of its proper divisors (37804399).

101780945 is an equidigital number, since it uses as much as digits as its factorization.

101780945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908039.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 101780945 is about 10088.6542710116. The cubic root of 101780945 is about 466.8981569755.

The spelling of 101780945 in words is "one hundred one million, seven hundred eighty thousand, nine hundred forty-five".