103156981 has 2 divisors, whose sum is σ = 103156982. Its totient is φ = 103156980.

The previous prime is 103156951. The next prime is 103156987. The reversal of 103156981 is 189651301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92332881 + 10824100 = 9609^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 103156981 - 2⁷ = 103156853 is a prime.

It is a super-2 number, since 2×103156981² = 21282725458068722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103156987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51578490 + 51578491.

It is an arithmetic number, because the mean of its divisors is an integer number (51578491).

Almost surely, 2^103156981 is an apocalyptic number.

It is an amenable number.

103156981 is a deficient number, since it is larger than the sum of its proper divisors (1).

103156981 is an equidigital number, since it uses as much as digits as its factorization.

103156981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 103156981 is about 10156.6225193221. The cubic root of 103156981 is about 468.9928349840.

The spelling of 103156981 in words is "one hundred three million, one hundred fifty-six thousand, nine hundred eighty-one".