100142681 has 2 divisors, whose sum is σ = 100142682. Its totient is φ = 100142680.

The previous prime is 100142671. The next prime is 100142687. The reversal of 100142681 is 186241001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97693456 + 2449225 = 9884^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 100142681 - 2¹⁸ = 99880537 is a prime.

It is a super-2 number, since 2×100142681² = 20057113115735522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (100142687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50071340 + 50071341.

It is an arithmetic number, because the mean of its divisors is an integer number (50071341).

Almost surely, 2^100142681 is an apocalyptic number.

It is an amenable number.

100142681 is a deficient number, since it is larger than the sum of its proper divisors (1).

100142681 is an equidigital number, since it uses as much as digits as its factorization.

100142681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 100142681 is about 10007.1315070803. The cubic root of 100142681 is about 464.3795339645.

Adding to 100142681 its reverse (186241001), we get a palindrome (286383682).

The spelling of 100142681 in words is "one hundred million, one hundred forty-two thousand, six hundred eighty-one".