100154981 has 2 divisors, whose sum is σ = 100154982. Its totient is φ = 100154980.

The previous prime is 100154941. The next prime is 100154983. The reversal of 100154981 is 189451001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67092481 + 33062500 = 8191^2 + 5750^2 .

It is a cyclic number.

It is not a de Polignac number, because 100154981 - 2⁶ = 100154917 is a prime.

It is a super-2 number, since 2×100154981² = 20062040438220722, which contains 22 as substring.

Together with 100154983, 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 (100154983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50077490 + 50077491.

It is an arithmetic number, because the mean of its divisors is an integer number (50077491).

Almost surely, 2^100154981 is an apocalyptic number.

It is an amenable number.

100154981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100154981 is an equidigital number, since it uses as much as digits as its factorization.

100154981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 100154981 is about 10007.7460499355. The cubic root of 100154981 is about 464.3985456199.

The spelling of 100154981 in words is "one hundred million, one hundred fifty-four thousand, nine hundred eighty-one".