106256981 has 2 divisors, whose sum is σ = 106256982. Its totient is φ = 106256980.

The previous prime is 106256959. The next prime is 106256993. The reversal of 106256981 is 189652601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 39262756 = 8185^2 + 6266^2 .

It is an emirp because it is prime and its reverse (189652601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 106256981 - 2¹⁴ = 106240597 is a prime.

It is a super-2 number, since 2×106256981² = 22581092022468722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106256881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53128490 + 53128491.

It is an arithmetic number, because the mean of its divisors is an integer number (53128491).

Almost surely, 2^106256981 is an apocalyptic number.

It is an amenable number.

106256981 is a deficient number, since it is larger than the sum of its proper divisors (1).

106256981 is an equidigital number, since it uses as much as digits as its factorization.

106256981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 106256981 is about 10308.1026867217. The cubic root of 106256981 is about 473.6444915102.

The spelling of 106256981 in words is "one hundred six million, two hundred fifty-six thousand, nine hundred eighty-one".