103132781 has 4 divisors (see below), whose sum is σ = 103307292. Its totient is φ = 102958272.

The previous prime is 103132751. The next prime is 103132811. The reversal of 103132781 is 187231301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187231301 = 19 ⋅9854279.

It is an interprime number because it is at equal distance from previous prime (103132751) and next prime (103132811).

It can be written as a sum of positive squares in 2 ways, for example, as 53655625 + 49477156 = 7325^2 + 7034^2 .

It is a cyclic number.

It is not a de Polignac number, because 103132781 - 2¹⁰ = 103131757 is a prime.

It is a super-2 number, since 2×103132781² = 21272741033587922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 103132781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103132751) 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, 86366 + ... + 87551.

It is an arithmetic number, because the mean of its divisors is an integer number (25826823).

Almost surely, 2^103132781 is an apocalyptic number.

It is an amenable number.

103132781 is a deficient number, since it is larger than the sum of its proper divisors (174511).

103132781 is an equidigital number, since it uses as much as digits as its factorization.

103132781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174510.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 103132781 is about 10155.4311085251. The cubic root of 103132781 is about 468.9561578274.

The spelling of 103132781 in words is "one hundred three million, one hundred thirty-two thousand, seven hundred eighty-one".