10406961781 has 4 divisors (see below), whose sum is σ = 10648984192. Its totient is φ = 10164939372.

The previous prime is 10406961737. The next prime is 10406961853. The reversal of 10406961781 is 18716960401.

10406961781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10406961781 - 2¹⁹ = 10406437493 is a prime.

It is a super-2 number, since 2×10406961781² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 242022367 = 10406961781 / (1 + 0 + 4 + 0 + 6 + 9 + 6 + 1 + 7 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10406964781) 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 in 3 ways as a sum of consecutive naturals, for example, 121011141 + ... + 121011226.

It is an arithmetic number, because the mean of its divisors is an integer number (2662246048).

Almost surely, 2^10406961781 is an apocalyptic number.

It is an amenable number.

10406961781 is a deficient number, since it is larger than the sum of its proper divisors (242022411).

10406961781 is an equidigital number, since it uses as much as digits as its factorization.

10406961781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242022410.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 10406961781 in words is "ten billion, four hundred six million, nine hundred sixty-one thousand, seven hundred eighty-one".