103780661 has 4 divisors (see below), whose sum is σ = 103915692. Its totient is φ = 103645632.

The previous prime is 103780657. The next prime is 103780673. The reversal of 103780661 is 166087301.

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 3900625 + 99880036 = 1975^2 + 9994^2 .

It is a cyclic number.

It is not a de Polignac number, because 103780661 - 2² = 103780657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103780601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66356 + ... + 67901.

It is an arithmetic number, because the mean of its divisors is an integer number (25978923).

Almost surely, 2^103780661 is an apocalyptic number.

It is an amenable number.

103780661 is a deficient number, since it is larger than the sum of its proper divisors (135031).

103780661 is an equidigital number, since it uses as much as digits as its factorization.

103780661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135030.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 103780661 is about 10187.2793718441. The cubic root of 103780661 is about 469.9361026760.

The spelling of 103780661 in words is "one hundred three million, seven hundred eighty thousand, six hundred sixty-one".