101849981 has 2 divisors, whose sum is σ = 101849982. Its totient is φ = 101849980.

The previous prime is 101849959. The next prime is 101850017. The reversal of 101849981 is 189948101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101324356 + 525625 = 10066^2 + 725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101849981 is a prime.

It is a super-2 number, since 2×101849981² = 20746837259400722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101849921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50924990 + 50924991.

It is an arithmetic number, because the mean of its divisors is an integer number (50924991).

Almost surely, 2^101849981 is an apocalyptic number.

It is an amenable number.

101849981 is a deficient number, since it is larger than the sum of its proper divisors (1).

101849981 is an equidigital number, since it uses as much as digits as its factorization.

101849981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 101849981 is about 10092.0751582616. The cubic root of 101849981 is about 467.0036957096.

The spelling of 101849981 in words is "one hundred one million, eight hundred forty-nine thousand, nine hundred eighty-one".