100782145 has 4 divisors (see below), whose sum is σ = 120938580. Its totient is φ = 80625712.

The previous prime is 100782139. The next prime is 100782161. The reversal of 100782145 is 541287001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66781584 + 34000561 = 8172^2 + 5831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100782145 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10078210 + ... + 10078219.

It is an arithmetic number, because the mean of its divisors is an integer number (30234645).

Almost surely, 2^100782145 is an apocalyptic number.

It is an amenable number.

100782145 is a deficient number, since it is larger than the sum of its proper divisors (20156435).

100782145 is an equidigital number, since it uses as much as digits as its factorization.

100782145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156434.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 100782145 is about 10039.0310787446. The cubic root of 100782145 is about 465.3658738370.

The spelling of 100782145 in words is "one hundred million, seven hundred eighty-two thousand, one hundred forty-five".