10158781 has 2 divisors, whose sum is σ = 10158782. Its totient is φ = 10158780.

The previous prime is 10158779. The next prime is 10158803. The reversal of 10158781 is 18785101.

10158781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7784100 + 2374681 = 2790^2 + 1541^2 .

It is a cyclic number.

It is not a de Polignac number, because 10158781 - 2¹ = 10158779 is a prime.

It is a super-2 number, since 2×10158781² = 206401662811922, which contains 22 as substring.

Together with 10158779, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10158481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5079390 + 5079391.

It is an arithmetic number, because the mean of its divisors is an integer number (5079391).

Almost surely, 2^10158781 is an apocalyptic number.

It is an amenable number.

10158781 is a deficient number, since it is larger than the sum of its proper divisors (1).

10158781 is an equidigital number, since it uses as much as digits as its factorization.

10158781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 10158781 is about 3187.2842672093. The cubic root of 10158781 is about 216.5777641841.

The spelling of 10158781 in words is "ten million, one hundred fifty-eight thousand, seven hundred eighty-one".